import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {

  public static void main(String[] args) throws Exception {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    String[] data = br.readLine().split(" ");
    br.close();
    long n = Long.parseLong(data[0]);
    long a = Long.parseLong(data[1]);
    long b = Long.parseLong(data[2]);
    long answer = n / (a + b) * a;
    answer += Math.min(a, n % (a + b));
    System.out.println(answer);
  }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz