#include<algorithm>

(资料图片)

#include<cmath>

#include<cstdio>

#include<iostream>

using namespace std;

int main(){

int a,b,c,x;

cin>>a>>b>>c;

for(int x=2;;x++){

if(a%x==b%x && b%x==c%x){

cout<<x;

return 0;

}

}

return 0;

}