#include<iostream>
using namespace std;
int main()
{
int a, b;
cin >> a >> b;
if (a == b) cout << a;
else
for(;;)
{
if (a > b) { a -= b; continue; }
else if (a < b) { b -= a; continue; }
break;
}
cout << a;
return 0;
}
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