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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
public class Collection{
 
    public static String week[] = { "monday", "tuesday", "wednesday",
            "thursday", "friday", "saturday", "sunday" };
    public static int number[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273,
            304, 334 };
 
    public static boolean leap(int rok) {
        return ((rok % 4 == 0 && rok % 100 != 0) || rok % 400 == 0);
    }
 
    public static int dayN(int day, int month, int year) {
        int dayYear;
        int a, b, c;
        int result;
        dayYear = day+ numberDay[month- 1];
        if ((month > 2) && (leap(year) == true))
            dayYear++;
        a = (year - 1) % 100;
        b = (year - 1) - a;
        c = a + (b / 4);
        d = (((((b / 100) % 4) * 5) + c) % 7);
        d += dayYear - 1;
        d %= 7;
        return f;
    }
}

Main.java:8: error: class Collection is public, should be declared in a file named Collection.java
public class Collection{
       ^
Main.java:23: error: cannot find symbol
        dayYear = day+ numberDay[month- 1];
                       ^
  symbol:   variable numberDay
  location: class Collection
Main.java:29: error: cannot find symbol
        d = (((((b / 100) % 4) * 5) + c) % 7);
        ^
  symbol:   variable d
  location: class Collection
Main.java:30: error: cannot find symbol
        d += dayYear - 1;
        ^
  symbol:   variable d
  location: class Collection
Main.java:31: error: cannot find symbol
        d %= 7;
        ^
  symbol:   variable d
  location: class Collection
Main.java:32: error: cannot find symbol
        return f;
               ^
  symbol:   variable f
  location: class Collection
6 errors

Standard output is empty