#include<iostream>
#include<string>
#include<algorithm>
#include<cctype>
#include<set>
#include<bitset>
#include<math.h>
#include<map>
#include<queue>
#include<iomanip>
using namespace std;


int main(){
    int d, a, b, c1, c2;
    float x;
    cin >> d >> a >> b;
    x = d*b/(a + b);
    if ((x - (int)x) > 0.5) x = x+1;
    else x = (int)x;
    cout << x * a + (d - x) * b << endl;
}