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