#include <iostream>
#include <vector>
using namespace std;

int main() {
    int base;
    while(cin>>base && base!=0){
        long long a,b;
        cin>>a>>b;
        long long n=a+b;
        if(n==0) {
            cout<<0<<endl;
            continue;}
        vector<int> ar;
        while(n>0){
            ar.push_back(n%base);
            n/=base;
        }
        for(int i=ar.size()-1;i>=0;i--) cout<<ar[i];
        cout<<endl;
    }
}
// 64 位输出请用 printf("%lld")