using System;
using System.Linq;
using static System.Console;
class yuki {    
    public static void Main(string[] args) => new yuki().Solve();
    
    string RadixConvert(int num, int radix) {
        var alpN = 'z' - 'a' + 1;
        var nums = Enumerable.Range(0, 10).Select(x => x.ToString());
        var alps = Enumerable.Range('a', alpN).Select(x => ((char)x).ToString());
        var elms = nums.Concat(alps).ToArray();
        var ret = "";
        var rem = 1;
        var quo = num;        
        while(quo > 0) {
            rem = quo % radix;
            ret += elms[rem];
            quo /= radix;
        }
        return string.Join("", ret.Reverse());
    }
    
    private void Solve() {
        var N = int.Parse(ReadLine());
        var ans = RadixConvert(N, 7);
        WriteLine(ans);
    }
}