#include <cstdio> #include <cstring> #include <iostream> #include <algorithm> #include<math.h> using namespace std; #define N 100 #define ll long long #define MOD 1000000007 double n, k, a, b; int main() { cin >> n >> k >> a >> b; double ans , t1, t2, t3, t; printf("%.2lf\n", n/b-n/a); return 0; }
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