#include<iostream>
using namespace std;
int main()
{
	int a,b,c,min;
	cout<<"a="; cin>>a;
	cout<<"b="; cin>>b;
	cout<<"c="; cin>>c;
	while(a!=b || a!=c || b!=c)
    {
		min=a;
		if(b<min) min=b;
		if(c<min) min=c;
		if(a!=min) a=a-min;
		if(b!=min) b=b-min;
		if(c!=min) c=c-min;
	}
	cout<<a;
	return 0;
}