#include<iostream>
using namespace std;
gcd(int a,int b){
	int c;
	while(c=a%b,c>=1){
		a=b;
		b=c;
	}
	return b;
}
int main(){
	int a,b,c;
	cin>>a>>b>>c;
	b=gcd(a,b);
	cout<<gcd(b,c);
	return 0;