#include <bits/stdc++.h>
using namespace std;
const int inf = 0x3f3f3f3f;
int n;
int a[10001], c[10001], d[10001];
int ans = 0;
char str[101];
int main() {
  scanf("%d", &n);
  for (int i = 1; i <= n; i++) {
    scanf("%s", str);
    if (str[0] == 'M') a[i] = 1;
    scanf("%d %d", &c[i], &d[i]);
  }
  for (int i = 1; i <= 366; i++) {
    int x = 0, y = 0;
    for (int j = 1; j <= n; j++) {
      if (c[j] <= i && i <= d[j]) {
        if (a[j])
          ++x;
        else
          ++y;
      }
    }
    ans = max(ans, min(x, y));
  }
  printf("%d\n", ans * 2);
  return 0;
}
