#include <bits/stdc++.h>
using namespace std;

ifstream fin("mins.in");
ofstream fout("mins.out");

bool vis[5001][5001];

int main()
{
  int n, m;
  fin >> n >> m;
  n--, m--;

  int res = 0;
  for (int i = 1; i <= n; i++)
    for (int j = 1; j <= m; j++)
      if (vis[i][j] == false)
      {
        res++;
        int k = 1, ni = i, nj = j;
        while (ni <= n && nj <= m)
        {
          vis[ni][nj] = true;
          ++k;
          ni = i * k, nj = j * k;
        }
      }

  fout << res;
  return 0;
}