import std.stdio, std.string, std.conv, std.algorithm;
import std.range, std.array, std.container;

immutable int mod = 10^^9 + 7;

void main() {
    int ans;
    int n = 6 * 10^^8;

    foreach (i ; 0 .. n) {
        (ans += i) %= mod;
    }

    writeln(0);
}


void readInput(T...)(ref T args) {
    string[] line = readln.split;
    foreach (ref arg ; args) {
        arg = line.front.to!(typeof(arg));
        line.popFront;
    }
    if (!line.empty) {
        throw new Exception("args num < input num");
    }
}