#include <iostream>
using namespace std;
int gcd(int x,int y) {
    while (y!=0) {
        int t=y;
        y=x%y;
        x=t;
    }
    return x;
}
int gcd2(int a,int b,int c) {
    return gcd(gcd(a,b),c);
}
int main() {
    int a,b,c;
    cin>>a>>b>>c;
    cout<<gcd2(a,b,c)<<endl;
    return 0;
}

#include <bits/stdc++.h>
using namespace std;
int main()
{
int a,b,c;
cin>>a>>b>>c;
cout<<__gcd(a,__gcd(b,c));
}