problem_1

#include <stdio.h>
int main()
{
  int y;
  scanf("%d", &y);
  if (y%400 == 0)
    printf("This is a leap year\n");
  else if (y%100 == 0)
    printf("This isn't a leap year\n");
  else if (y%4 == 0)
    printf("This is a leap year\n");
  else
    printf("This isn't a leap year\n");
  return 0;
}