#include"bits/stdc++.h" //#include<bits/stdc++.h> using namespace std; #define print(x) cout<<x<<endl; #define rep(i,a,b) for(int i=a;i<b;i++) typedef long long ll; const ll mod = 10000000000; int main(){ int h, a, d; double dp[10002]; memset(dp, -1, sizeof(dp)); cin >> h >> a >> d; double ans = 0; dp[0] = 0; rep(i, 1, a+1)dp[i] = 1; rep(i, a + 1, d + 1)dp[i] = 1.5; rep(i, d+1, 10002) { dp[i] = min(dp[i - a] + 1, dp[i - d] + 1.5); } print(dp[h]); return 0; }