#include<stdio.h>
int main(){
    int Month;
    scanf("%d",&Month);
    switch(Month)
    {
    case 1:
    printf("31 days\n");
    break;
    case 2:
    printf("28 days(29 days for leap year)\n");
    break:
    case 3:
    printf("31 days\n");
    break;
    case 4:
    printf("30 days\n");
    break;
    case 5:
    printf("31 days\n");
    break;
    case 6:
    printf("30 days\n");
    break;
    case 7:
    printf("31 days\n");
    break;
    case 8:
    printf("31 days\n");
    break;
    case 9:
    printf("30 days\n");
    break;
    case 10:
    printf("31 days\n");
    break;
    case 11:
    printf("30 days\n");
    break;
    case 12:
    printf("31 days\n");
    break;
    default:
    printf("Invalid input");
    break;
return 0;
}
}