#include <iostream>
using namespace std;
 
int main() {
  int arr[1000][1000], n, m, count1 = 1, count2 = 1, result = 0;
  cin >> n >> m;
  for (int i = 0; i < n; i++)
    for (int j = 0; j < m; j++)
      arr[i][j] = count1++;
  for (int j = 0; j < m; j++) {
    for (int i = 0; i < n; i++) {
      if (arr[i][j] == count2) result++;
      count2++;
    }
  }
  cout << result << "\n";
}