#include<stdio.h>
#include<math.h>
int main(){
    float hours;
    int fee;
    scanf("%f",&hours);
    if(hours<=0||hours>24){
        printf("Invalid input");
        return 0;
    }
    fee=10;
    if(hours>1){
        fee++
    printf("%d",fee);
    return 0;
}