#include <iostream>

#include <map>

using namespace std;

​

int main() {

  map<string, int> people = { {"John", 32}, {"Adele", 45}, {"Bo", 29} };

​

  // Change John's value to 50 instead of 32

  people.at("John") = 50;

  cout << "John is: " << people.at("John");

  return 0;

}

​