#include <iostream>
#include <array>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    string S;
    cin >> S;
    int n = S.size();
    long long res = -1LL + n + n;
    for (int i = 0; i < n - 1; i++) {
        array<int, 3> L = { 0, 0, 0 };
        auto& [a, b, c] = L;
        auto& comp = L[S[i] - 'a'];
        L[S[i] - 'a']++, L[S[i + 1] - 'a']++;
        for (int j = i + 2; j < n; j++) {
            L[S[j] - 'a']++;
            if ((a == 0 || a == comp) && (b == 0 || b == comp) && (c == 0 || c == comp)) res++;
        } 
    }

    cout << res;
}