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