#include <iostream>

using namespace std;

int main()
{
    int i1, i2, i3, i4, count=0;
    
    cin >> i1 >> i2 >> i3;
    
    while(cin >> i4)
    {
        if (i2+i3+i4 > i1+i2+i3) count++;
        i1 = i2;
        i2 = i3;
        i3 = i4;
    }

    cout << count << endl;

    return 0;
}