#include<stdio.h>
int main()
{
  int n,i;
  long long int s=0;
  do{scanf("%d",&n);
  }while(!(n>=1 && n<=1000000));
   for(i=1;i<=n;i++)
    s+=(i%10);
   if(s%2)
    printf("%d",16);
   else
    printf("%d",15);
    return 0;
}