What will be the output of the following C++ code?

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
int main ()  
{
    int myints[] = {10, 20, 30, 5, 15};
    vector<int> v(myints, myints + 5);
    make_heap (v.begin(), v.end());
    pop_heap (v.begin(), v.end());
    v.pop_back();
    cout << v.front() << '\n';
    return 0;
}