C++11 search an std::map with composite key

I want to implement a function (findn) below that search on the std::map to find an element. However in my case the key is composite value, it is an

How do I use the std::map.find here?

#include <iostream>
#include <map>
#include <utility>
#include <string>

using namespace std;

std::map<std::pair<int, int>, std::string> studentMap;


int insert(int i, int j, std::string name) {

        if( !studentMap.insert( std::make_pair ( std::make_pair(i,j), name)).second ) { 
                std::cout << "game not added" << std::endl;
        } else {
                std::cout << "game added" << std::endl;
        }

        return 0;
}

void findn(int i, int j) {

// how to find when we have composite key?

}

int main(int argc, char** argv) {


        insert(1,1,"test");
        insert(1,1,"tes");
        insert(1,2,"test 2");

        std::cout << studentMap.size() << std::endl;
        findn(1,1);

        return 0;
}