#include <stdio.h>
 
int Zeller(int year, int month, int day) {
    if (month == 1 || month == 2) {
        month += 12;
        year -= 1;
    }
     int C = year / 100;     
    int Y = year % 100;     
 
    int weekday = ((day + (26 * (month + 1) / 10) + Y + Y / 4 + 5 * C + C / 4) + 5) % 7;
 
    return weekday;
}
 
int main() {
    int year, month, day;
 
    scanf("%d %d %d", &year, &month, &day);
 
    int weekday = Zeller(year, month, day);
 
 
    printf("曜日番号（月曜=0〜日曜=6）: %d\n", weekday);
 
    return 0;
}

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2020 6 27