#include<bits/stdc++.h>
using namespace std;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    int xa,xb,xc,ya,yb,yc;
    cin >>xa>>ya>>xb>>yb>>xc>>yc;
    if ((xa-xb)*(ya-yc)==(xa-xc)*(ya-yb)){
        cout<< "YES" << endl;
    }else{
        cout<< "NO" <<endl;
    }
    return 0;
}

#danglam228

#include <bits/stdc++.h>
using namespace std;
#define ll long long
ll xa, ya, xb, yb, xc, yc;
int main() {
    cin >> xa >> ya >> xb >> yb >> xc >> yc;
    ll res = xa * (yb - yc) + xb * (yc - ya) + xc * (ya - yb);
    if (res == 0) {
        cout << "YES" << endl;
    } else {
        cout << "NO" << endl;
    }
    return 0;
}