题解：暴力出奇迹

#include <bits/stdc++.h>
using namespace std;
int main(){
    int a,b,c;
    cin >> a >> b >> c;
    for(int i=2;i<=10000000;i++)
        if(a%i == b%i && b%i == c%i)
        {
            cout << i << endl;
            return 0;
        }
    return 0;
}