#include <bits/stdc++.h>
using namespace std;
long long int apo[1000006];
long long int ahash[1000006];
long long int magic1 = 173LL, magic2 = 97LL;
char str[1000006];
int len;
void inithash() {
  int n = len;
  apo[0] = 1LL;
  ahash[0] = 0LL;
  for (int i = 1; i <= n; i++) {
    apo[i] = (apo[i - 1] * magic1);
    ahash[i] = (ahash[i - 1] * magic1 + str[i - 1]);
  }
  return;
}
inline long long int getHash(int i, int j) {
  long long int h1 = (ahash[j] - (ahash[i - 1] * apo[j - i + 1]));
  return h1;
}
int main() {
  int t;
  t = 1;
  while (t--) {
    strcpy(str, "bear");
    len = 4;
    inithash();
    strcpy(str, "");
    long long int val = getHash(1, 4);
    cin >> str;
    len = strlen(str);
    if (len < 4) {
      cout << "0\n";
      continue;
    }
    inithash();
    long long int ans = 0, s, a, b;
    int prev = 0;
    for (int i = 1; i <= len; i++) {
      if (getHash(i, i + 3) == val) {
        a = i - prev;
        b = len - 3 - i + 1;
        s = ((a) * (b));
        ans += s;
        prev = i;
      }
    }
    cout << ans << "\n";
  }
}
