# include <bits/stdc++.h>
using namespace std;
ifstream fi("mins.in");
ofstream fo("mins.out");
bitset < 10005 > s[10005];
int main(void)
{
    int n,m;
    fi>>n>>m;
    --n;--m;
    for (int i = 1;i <= n;++i)
        for (int j = 1;j <= m;++j) s[i][j] = 1;
    int ans = 0;
    for (int i = 1;i <= n;++i)
        for (int j = 1;j <= m;++j)
            if (s[i][j])
            {
                ++ans;
                int x = i,y = j;
                while (x <= n && y <= m) s[x][y] = 0,x += i,y += j;
            }
    return fo << ans << '\n',0;
}