#include <bits/stdc++.h>
int main() {
  int no_commands, res, counter_L = 0, counter_R = 0;
  char commands[100002];
  scanf("%d", &no_commands);
  for (int i = 0; i < no_commands; i++) {
    scanf("%s", commands);
  }
  for (int i = 0; i < no_commands; i++) {
    if (commands[i] == 'L') {
      counter_L++;
    } else {
      counter_R++;
    }
  }
  res = counter_R + counter_L + 1;
  printf("%d\n", res);
}
