1  #include <iostream>
 2  #include <fstream>
 3  
 4  using namespace std;
 5  
 6  int main() {
 7      int total = 0;
 8      int a = 0, b = 0, c = 0, d = 0;
 9      int rownumber = 0;
10  
11      while (cin >> d) {
12          if (rownumber >= 3) {
13              if (a + b + c < b + c + d) {
14                  total++;
15              }
16          }
17          rownumber++;
18          a = b;
19          b = c;
20          c = d;
21      }
22  
23      cout << total << endl;
24      return 0;
25  }