#include <cstdio>
using namespace std;
int a,b;
int gcd(int a,int b)
{
int t;
while (b!=0)
{
t=b;
b=a % b;
a=t;
}
return a;
}
int main()
{
scanf("%d%d",&a,&b);
printf("%d",gcd(a,b));
return 0;
}
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