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

int main(){
    multiset<int> A;
    multiset<int> B;
    for (int i = 1; i <= 1000000; i++){
        A.insert(i);
        B.insert(2*i + 1);
    }
    auto t1 = clock();
    swap(A, B);
    auto t = clock() - t1;
    cout << ((float) t)/CLOCKS_PER_SEC << endl;
}