#include <stdio.h>

unsigned long long gcd(__int128 a, __int128 b){
    __int128 r = a % b;
    if(r == 0){
        return (unsigned long long)b;
    }else{
        return gcd(b, r);
    }
}

int main(){
    unsigned long long a, b;
    scanf("%llu %llu", &a, &b);
    __int128 apb = (__int128)(a + b);
    __int128 axb = (__int128)(a * b);
    unsigned long long answer;
    if(apb > axb){
        answer = gcd(apb , axb);
    }else{
        answer = gcd(axb , apb);
    }
    printf("%llu", answer);
    return 0;
}