#unittest {
    name: "Nested for loops.";
    result: 20131375;
};

func main() {
    var sum = 0;
    for (var a in 0...10) {
        for (var b in 10...20) {
            for (var c in 20...30) {
                for (var d in 30...40) {
                    for (var e in 40...50) {
                        var n = a + b + c + d + e;
                        sum += n;
                    }
                }
            }
        }
    }
    return sum;
}