#include <bits/stdc++.h>
using namespace std;
void solve() {
  int y, b, r;
  cin >> y >> b >> r;
  while (1) {
    if (r - 1 <= b && r - 2 <= y) {
      break;
    }
    --r;
  }
  cout << 3 * r - 3;
}
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  solve();
  return 0;
}
