import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner cin = new Scanner(System.in);
        String[] line = cin.nextLine().split(" ");
        long N = Long.parseLong(line[0]);
        long A = Long.parseLong(line[1]);
        long B = Long.parseLong(line[2]);

        long ans = N/(A+B) * A + Math.min(A, N%(A+B));
        System.out.println(ans);
        cin.close();
    }
}
/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