#include <stdio.h>
int main() {
    int month;
    scan("%d" , &month);
    switch (month) {
        case 1;
        case 3;
        case 5;
        case 7;
        case 8;
        case 10;
        case 12;
             printf("31 days\n");
             break;
        case 4;
        case 6;
        case 9;
        case 11;
             printf("30 days\n");
             br
        
    }