#include<bits/stdc++.h>
using namespace std;
#define el "\n"
#define ll long long
#define ull unsigned long long
#define se second
#define fi first
#define be begin()
#define en end()
#define Faster cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(0);
 
int main()
{
    Faster;
    int xA, yA, xB, yB, xC, yC;
    cin >> xA >> yA >> xB >> yB >> xC >> yC;
    if((yB - yA) * (xC - xB) == (yC - yB) * (xB - xA)) cout << "YES";
    else cout << "NO";
    return 0;
}
 

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