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#include <bits/stdc++.h>
using namespace std;
// 给出一个数字，比如(11)，将其转为2进制，计算出它的十进制是多少,答案应该是3
//1234
int convert(string s, int k) {
int res = 0;
for (int i = 0; i < s.size(); i++) {
int x = s[i] - '0';
if (x >= k) return -1;
res += x * pow(k, s.size() - 1 - i); // 105
}
return res;
int main() {
string a, b, c;
cin >> a >> b >> c;
bool flag = false;
for (int k = 2; k <= 16; k++) {
int x = convert(a, k);
int y = convert(b, k);
int z = convert(c, k);
if (x * y == z) {
cout << k << endl;
flag = true;
break;
if (!flag) cout << 0 << endl;
return 0;
