#include<stdio.h>
void main(){
    int n;
    scanf("%d",&n);
   if(n<0 || n>12)
    {
        printf("Invalid input");
        return ;
    } 
    switch(n)
    {
        case 1:
        printf("31 days");
        break;
        case 2:
        printf("28 days(29 in leap years)");
        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;
        default:
        printf("Invalid input");
    }
    return 0;
        
    
}