#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int r = 0, l = 0;
  while (n--) {
    char c;
    cin >> c;
    if (c == 'L')
      l++;
    else
      r++;
  }
  cout << l + r + 1;
  return 0;
}
