#include <stdio.h>

/* 1990年1月1日 是星期一 */

int is_leap_year(int year) {
    return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
}

int get_days_in_month(int month, int is_leap) {
    int days_in_month[] = {31, 28 + is_leap, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    return days_in_month[month - 1];
}

int calculate_days(int year, int month, int day) {
    int sum = 0;
    for (int i = 1990; i < year; i++) {
        sum += is_leap_year(i) ? 366 : 365;
    }
    for (int i = 1; i < month; i++) {
        sum += get_days_in_month(i, is_leap_year(year));
    }
    return sum + day;
}

void print_weekday(int sum, int year, int month, int day) {
    const char* days_of_week[] = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"};
    printf("%d年%d月%d日是%s\n", year, month, day, days_of_week[sum % 7]);
}//判断星期几

int main() {
    int year, month, day;
    printf("请输入日期（格式：年/月/日）：");
    scanf("%d/%d/%d", &year, &month, &day);

    int total_days = calculate_days(year, month, day);
    print_weekday(total_days, year, month, day);

    return 0;
}