SODAO1 C++

#include <bits/stdc++.h>
using namespace std;
int x,y,a;
int main ()
{
    freopen("sodao1.inp","r",stdin);
    freopen("sodao1.out","w",stdout);
    //scanf("%d",&x);
    cin<<x;
    y=0;
    while(x>0)
    {
           a=x%10;
        y=y*10+a;
        x=x/10;
    }
    //printf("%d",y%19);
    cout<<(y%19) ;
}