#include <iostream>
#include <cassert>
#include <algorithm>
#include <vector>
using namespace std;
int main()
{
vector<int> v(7);
v[0] = 25;
v[1] = 7;
v[2] = 9;
v[3] = 2;
v[4] = 0;
v[5] = 5;
v[6] = 21;
const int N = 4;
// Use nth_element to place the Nth smallest
// element in v in the Nth position, v.begin() + N:
nth_element(v.begin(), v.begin() + N, v.end());
for (int i = 0; i < N; ++i)
assert (v[N] >= v[i]);
for (int i = N + 1; i < 7; ++i)
cout << v[N];
return 0;
}
/*
99
*/
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