process.stdin.resume();
process.stdin.setEncoding('ascii');

var input_stdin = "";
var input_stdin_array = "";
var input_currentline = 0;

process.stdin.on('data', function (data) {
    input_stdin += data;
});

process.stdin.on('end', function () {
    input_stdin_array = input_stdin.split("\n");
    main();    
});

function readLine() {
    return input_stdin_array[input_currentline++];
}

/////////////// ignore above this line ////////////////////

function slopeIntercept(p1,p2) {
    if (p1.x - p2.x === 0) {
        return { fixed: p1.x };
    }
    var m = (p1.y - p2.y) / (p1.x - p2.x) ;
    var b = p1.y - (m * p1.x) ;
    return { m: m, b: b};
}   

function onLine(line,p) {
    if (line.fixed !== undefined) { return (line.fixed === p.x); }
    return (p.y.toFixed(2) === (line.m * p.x + line.b).toFixed(2));
}

function main() {
    var p = [];
    var n = parseInt(readLine());
    for(var a0 = 0; a0 < n; a0++){
        var x_temp = readLine().split(' ');
        var x = parseInt(x_temp[0]);
        var y = parseInt(x_temp[1]);
        p[p.length]={x: x, y: y};
    }
    line = slopeIntercept(p[0],p[1]);
    for (var i=2; i<n; i++) {
        if (!onLine(line, p[i])) { console.log('NO'); return; }
    }
    console.log("YES")
}