#include <stdio.h>

int main() {
    int x,y,n,m;
    scanf("%d",&n);
    y=n%12;
    x=n/12;

    if(y!=0&&n<12)
    m=2;
    else if(y!=0&&n>=12)
    m=4*x+2;
    printf("%d\n",m);
    return 0;
}