diff --git a/src/main/java/ru/dmitriymx/corrector1s/Corrector1S.java b/src/main/java/ru/dmitriymx/corrector1s/Corrector1S.java
new file mode 100644
index 0000000..a341dcb
--- /dev/null
+++ b/src/main/java/ru/dmitriymx/corrector1s/Corrector1S.java
@@ -0,0 +1,70 @@
+package ru.dmitriymx.corrector1s;
+
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.poi.ss.usermodel.Cell;
+import org.apache.poi.ss.usermodel.Sheet;
+import org.apache.poi.ss.usermodel.Workbook;
+import org.apache.poi.ss.usermodel.WorkbookFactory;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.util.HashMap;
+import java.util.Map;
+
+@Slf4j
+@NoArgsConstructor
+public class Corrector1S {
+    private class ExcelRecord {
+        private String name;
+        private String addition;
+        private Double data;
+    }
+
+    @Setter
+    private File sourceFile;
+    @Setter
+    private File targetFile;
+    @Setter
+    private double honorarium;
+
+    private Map<String, ExcelRecord> mapRecords = new HashMap<>(19); // ожидается 19 записей для сохранения
+
+    private String getFileExtension(File file) {
+        int i = file.getAbsolutePath().lastIndexOf('.');
+        if (i > 0) {
+            return file.getAbsolutePath().substring(i+1);
+        } else {
+            return "";
+        }
+    }
+
+    public void check() throws Exception {
+        if (honorarium == 0.0d) throw new AssertionError("Honorarium not be 0.0%!");
+
+        if (sourceFile == null) throw new AssertionError("Source file not be null!");
+        else if (!sourceFile.exists()) throw new FileNotFoundException(sourceFile.getAbsolutePath());
+        else if (!getFileExtension(sourceFile).equalsIgnoreCase("xls")
+                    && !getFileExtension(sourceFile).equalsIgnoreCase("xlsx")) throw new AssertionError("Source file must be XLS/XLSX format");
+
+        if (targetFile == null) throw new AssertionError("Target file not be null!");
+
+        Workbook workbook = WorkbookFactory.create(sourceFile);
+        Sheet sheet = workbook.getSheetAt(0);
+        try {
+            Cell cell = sheet.getRow(6).getCell(9);
+            if (!cell.getStringCellValue().equals("Больничный за счет работодателя")) {
+                throw new FormatFileException();
+            }
+
+            sheet.getRow(7).getCell(9);
+            sheet.getRow(8).getCell(9);
+            sheet.getRow(9).getCell(9);
+        } catch (FormatFileException e) {
+            throw e;
+        } catch (Exception e) {
+            throw new FormatFileException(e);
+        }
+    }
+}
diff --git a/src/main/java/ru/dmitriymx/corrector1s/FormatFileException.java b/src/main/java/ru/dmitriymx/corrector1s/FormatFileException.java
new file mode 100644
index 0000000..f274d8a
--- /dev/null
+++ b/src/main/java/ru/dmitriymx/corrector1s/FormatFileException.java
@@ -0,0 +1,15 @@
+/*
+ * DmitriyMX <dimon550@gmail.com>
+ * 2018-06-03
+ */
+package ru.dmitriymx.corrector1s;
+
+public class FormatFileException extends Exception {
+    public FormatFileException() {
+        super();
+    }
+
+    public FormatFileException(Throwable cause) {
+        super(cause);
+    }
+}
diff --git a/src/main/java/ru/dmitriymx/corrector1s/Main.java b/src/main/java/ru/dmitriymx/corrector1s/Main.java
index 7652696..3eabc56 100644
--- a/src/main/java/ru/dmitriymx/corrector1s/Main.java
+++ b/src/main/java/ru/dmitriymx/corrector1s/Main.java
@@ -73,6 +73,12 @@ public class Main {
             log.debug("Source file: {} (exists: {})", sourceFile.getAbsolutePath(), Files.exists(sourceFile.toPath()));
             log.debug("Target file: {}", targetFile.getAbsolutePath());
             log.debug("Honorarium: {}%", optionSet.valueOf("fee"));
+
+            Corrector1S corrector1S = new Corrector1S();
+            corrector1S.setSourceFile(sourceFile);
+            corrector1S.setTargetFile(targetFile);
+            corrector1S.setHonorarium((Double) optionSet.valueOf("fee"));
+            corrector1S.check();
         }
     }
 }