#include <stdio.h>

int main() {
    int n=0;
    int time=0;
    int tem=0;
    scanf("%d",&n);
    tem=n;
    while(n>=12)
    {
        n=n-12;
        time=time+4;
    }
    time=time+2;
    if(tem<12)
    {
        time=2;
    }
    printf("%d",time);
    return 0;
}