import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// 整数の入力
		long N = sc.nextLong();
      	long A = sc.nextLong();
      	long B = sc.nextLong();
      	
      	long blue=N/(A+B);
		long mod=N%(A+B);
      if(mod>=A){
      mod=A;
	}
      System.out.println(blue*A+mod);
      
    }
}

/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