#include<bits/stdc++.h> using namespace std; int C(char *x,int y){ int t = 0; for(int i = 0; i < strlen(x); i ++) { if(x[i] - '0' >= y){ return -1; } t = t * b +x[i] - '0'; } return num; } int main() { char p[10],q[10],r[10]; cin >> p >> q >> r; int t = 0; for(int i = 2; i <= 16; i ++){ int pi = C(p,i); int qi = C(q,i); int ri = C(r,i); if(pi == -1 || qi == -1 || ri == -1){ continue; } if(pi*qi==ri){ t = i; break; } } cout << t << endl; return 0; }