#include <bits/stdc++.h>

using namespace std;

std::ostream&
operator<<(std::ostream& dest, __int128_t value)
{
    std::ostream::sentry s(dest);
    if (s) {
        __uint128_t tmp = value < 0 ? -value : value;
        char buffer[128];
        char* d = std::end(buffer);
        do
        {
            --d;
            *d = "0123456789"[tmp % 10];
            tmp /= 10;
        } while (tmp != 0);
        if (value < 0) {
            --d;
            *d = '-';
        }
        int len = std::end(buffer) - d;
        if (dest.rdbuf()->sputn(d, len) != len) {
            dest.setstate(std::ios_base::badbit);
        }
    }
    return dest;
}

__int128 gcd(__int128 a, __int128 b)
{
    if (b == 0)
    {
        return a;
    }
    return gcd(b, a % b);
}
int main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);

    long long int A, B;

    cin >> A >> B;
    __int128 a = A;
    __int128 b = B;
    __int128 X = A + B;
    __int128 Y = a * b;

    cout << gcd(X, Y) << '\n';
    return 0;
}