import std.stdio;
import std.string;
import std.algorithm;
import std.conv;
//---------------------
void main(){
  auto mod = 1_000_007;
  auto N = readln.chomp.to!long;
  long sol1(long n){
    auto upper = n/2;
    auto lower = n - upper;
    auto res = (lower%mod) + ((lower%mod)+1)*(upper%mod);
    return res%mod;
  }
  sol1(N).writeln;
}