#include<iostream>
#include<string>
#include<cctype>
#include<vector>

#include<algorithm>
#include<functional>
using namespace std;

int main() {
#ifdef LOCAL
	freopen("d:\\datain.txt", "r", stdin);
	//freopen("d:\\dataout.txt", "w", stdout);
#endif LOCAL
	long long a, b;
	scanf(" %lld %lld", &a, &b);
	int d;
	cin >> d;
	long long c = a + b;
	if (c == 0) {
		cout << 0;
		return 0;
	}
	//cout << a << " " << b << " " << c << endl;
	int y[100];
	int j = 0;
	while (c != 0) {
		y[j++] = c % d;
		//cout << y[j] << endl;
		c = c / d;
	}
	for (int i = j - 1; i >= 0; i--) {
		printf("%d", y[i]);
	}
}