moyf

#include<bits/stdc++.h>
using namespace std;
int main(){
freopen("p1649.in","r",stdin);
freopen("p1649.out","w",stdout);
int n,k,i=0;
cin>>n;
if(n%7==0){
cout<<n;
return 0;
}else{
k=n;
while(k>0){
i=i+k%10;
k=k/10;
}
cout<<i%7;
return 0;
}
fclose(stdin);
fclose(stdout);
return 0;
}
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