#include <bits/stdc++.h>
using namespace std;

int main(){
    long long p,q,r,i,next,mod;
    long long K;
    cin>>p>>q>>r>>K;
    vector<long long> memo(1000,0);
    i=(p%10)*100+(q%10)*10+(r%10);
    memo[i]=1;
    while(memo[i]!=K){
       	next=(i*10)%1000+(i/100+i/10+i)%10;
      	if(memo[next]){
          	mod=memo[i]+1-memo[next];
          	memo[next]+=mod*((K-memo[next])/mod);
        }else{
          	memo[next]=memo[i]+1;
        }
      	i=next;
    }
    cout<<(i/100)<<endl;
}