#include <bits/stdc++.h>
using namespace std;
int n, cl, cr;
string s;
int main() {
  cin >> n >> s;
  for (int i = 0; i < n; i++) {
    if (s[i] == 'R')
      cr++;
    else
      cl++;
  }
  cout << cr + cl + 1;
}
