#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 leapyear));
        break;
        case 4:
        case 6:
        case 9:
        case 11:
        printf("30days");
        break;
    }
    return 0;
}