Giúp mình bàu này với làm C++

#include<bits/stdc++.h>
using namespace std;
long long n,i,j,k,a[100000],d,b[100000];
int main() {
#define TASKNAME "ICECREAM"
if(fopen(TASKNAME".inp","r")){
     freopen(TASKNAME".inp","r",stdin);
     freopen(TASKNAME".out","w",stdout);
}
cin>>n;
if (n==1)
     cout<<5000;
else
if (n<=5)
     cout<<5000+(n-1)*4500;
     else
          if (n<=120)
               cout<<5000 +4*4500 +(n-5)*3500;
          else 
                cout<<setprecision<<fixed<<(5000 +4*4500 +(n-5)*3500) *90/100;
return 0;
}

#include <bits/stdc++.h>
#define max 1e18
#define min -1e18
#define ll long long
#define ull unsigned long long
#define bigInt __in128
using namespace std;
int main() {
 ios_base::sync_with_stdio(false);
 cin.tie(0);
 cout.tie(0);
 #ifdef LOCAL
 freopen("task.inp","r",stdin);
 #endif
 ll n;
 double s = 0;
 cin >> n;
 bool discount = n > 120;
 if (n >= 1) {
  s = s + 5000;
  n--;
 }
 for (ll i = 2; i <= 5 && n > 0; i++, n--) s = s + 4500;
 s = s + 3500*n;
 if (discount) s = 0.9*s;
 cout << fixed << setprecision(2) << s;
 return 0;
}