#include <iostream>
#include <vector>

using namespace std;

int main()
{
    long long N;
    cin >> N;

    vector<long long> M;
    long long a=0;

    while (N>0)
    {
        N=N/10-3*(N%10);
        M.emplace_back(N);
        a=a+1;
    }
    if (N==0)
    {
        cout << "IGEN" << endl;
    }
    for (long long i=0; i<a; i++)
    {
        cout << M[i];
    }

    return 0;
}