import std.stdio;
import std.algorithm;
import std.range;
import std.bigint;


void main(string[] args)
{
    auto input = readln.splitter.map!(BigInt).array;
    auto a = input[0] + input[1], b = input[0] * input[1];
    if (a < b) {
        swap(a, b);
    }
    while (b) {
        immutable t = a % b;
        a = b;
        b = t;
    }
    writeln(a);
}