#include<stdio.h>

typedef struct{
    int year;
    int month;
    int day;
}Date;

Date input_date(Date days);
int isLeap(Date days);

int main(void)
{
    Date date;

    date=input_date(date);

    if(isLeap(date)){
        printf("%d/%d/%d is a leap.\n",date.year,date.month,date.day);
    }

    return 0;
}

Date input_date(Date ymd)
{
    printf("year : ");scanf("%d",&ymd.year);
    printf("month : ");scanf("%d",&ymd.month);
    printf("day : ");scanf("%d",&ymd.day);

    return ymd;
}

int isLeap(Date days)
{
    return(days.year%4==0&&days.year%100!=0||days.year%400==0);
}