#include <stdio.h>
int main(){
    int month;
    scanf("%d",&month);
    if(month< 1|| month>12)
        printf("Invalid input);
     switch (month){
        case 1: printf("31 days"); break;
        case 2: printf("28 days"); break;
        case 3: printf("31 days"); break;
        case 4: printf("30 days"); break;
        case 5: printf("31 days"); break;
        case 6: printf("30 days"); break;
        case 7: printf("31 days"); break;
        case 8: printf("31 days"); break;
        case 9: printf("30 days"); break;
        case 10: printf("31 days"); break;
        case 11: printf("30 days"); break;
        case 12: printf("31 days"); break;
    }
    return 0;
}