#include <stdio.h>

unsigned long long gcd(unsigned long long a, unsigned long long b){
    unsigned long long r = a % b;
    if(r == 0){
        return b;
    }else{
        return gcd(b, r);
    }
}

int main(){
    unsigned long long a, b;
    scanf("%llu %llu", &a, &b);
    unsigned long long r = (a * b) % (a + b);
    unsigned long long answer = gcd(a + b, r);
    printf("%llu", answer);
    return 0;
}