#include <iostream>
#include <stdexcept>
using namespace std;
 
int main() {
   int userAge;
   int avgMaxHeartRate;
 
   try {
      cin >> userAge;
 
      if (userAge < 0) {
         throw runtime_error("Invalid age");
      }
 
      // Source: https://w...content-available-to-author-only...t.org/en/healthy-living/fitness
      avgMaxHeartRate = 220 - userAge;
 
      cout << "Avg: " << avgMaxHeartRate << endl;
   }
   catch (runtime_error& excpt) {
      cout << "Error: " << excpt.what() << endl;
   }
 
   return 0;
}

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LTEw

-10