#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  char ch;
  int i = 0, j = 0;
  while (n--) {
    cin >> ch;
    if (ch == 'L') i++;
    if (ch == 'R') j++;
  }
  cout << i + j + 1 << endl;
  return 0;
}
