#include<bits/stdc++.h>

using namespace std;
using ll=long long;

// マクロの定義
#define all(x) x.begin(), x.end()
#define len(x) ll(x.size())
#define elif else if
#define unless(cond) if (!(cond))

// オーバーロードマクロ
#define overload2(_1, _2, name, ...) name
#define overload3(_1, _2, _3, name, ...) name
#define overload4(_1, _2, _3, _4, name, ...) name
#define overload5(_1, _2, _3, _4, _5, name, ...) name

// 繰り返し系
#define rep1(n) for (ll i=0; i<n; i++)
#define rep2(i,n) for (ll i=0; i<n; i++)
#define rep3(i,a,b) for (ll i=a; i<b; i++)
#define rep4(i,a,b,c) for (ll i=a; i<b; i+=c)
#define rep(...) overload4(__VA_ARGS__,rep4,rep3,rep2,rep1)(__VA_ARGS__)

#define foreach1(x,a) for (auto &&x: a)
#define foreach2(x,y,a) for (auto &&[x,y]: a)
#define foreach3(x,y,z,a) for (auto &&[x,y,z]: a)
#define foreach4(x,y,z,w,a) for (auto &&[x,y,z,w]: a)
#define foreach(...) overload5(__VA_ARGS__,foreach4,foreach3,foreach2,foreach1)(__VA_ARGS__)

// 除算に関する関数
template<typename T, typename U>
T floor(T x, U y){return (x>0 ? x/y: (x-y+1)/y);}

template<typename T, typename U>
T ceil(T x, U y){return (x>0 ? (x+y-1)/y: x/y);}

template<typename T, typename U>
T mod(T x, U y){
    T q=floor(x,y);
    return x-q*y;
}

template<typename T, typename U>
pair<T,T> divmod(T x, U y){
    T q=floor(x,y);
    return {q,x-q*y};
}

// 指数に関する関数
ll intpow(ll x, ll y){
    ll a=1;
    while (y){
        if (y&1) a*=x;
        x*=x;
        y>>=1;
    }
    return a;
}

ll modpow(ll x, ll y, ll z){
    ll a=1;
    while (y){
        if (y&1) (a*=x)%=z;
        (x*=x)%=z;
        y>>=1;
    }
    return a;
}

ll sum(vector<int> &X){
    ll y=0;
    for (auto &&x: X) y+=x;
    return y;
}

template<typename T>
T sum(vector<T> &X){
    T y=T(0);
    for (auto &&x: X) y+=x;
    return y;
}

// max, min
template<typename T, typename U>
inline bool chmax(T &a, const U b){
    return (a<b ? a=b, 1: 0);
}

template<typename T, typename U>
inline bool chmin(T &a, const U b){
    return (a>b ? a=b, 1: 0);
}

template<class... T>
constexpr auto max(T... a){
    return max(initializer_list<common_type_t<T...>>{a...});
}
template<class... T>
constexpr auto min(T... a){
    return min(initializer_list<common_type_t<T...>>{a...});
}

// 入出力
template<class... T>
void input(T&... a){(cin >> ... >> a);}

void print(){cout << "\n";}

template<class T, class... Ts>
void print(const T& a, const Ts&... b){
    cout << a;
    (cout << ... << (cout << " ", b));
    cout << "\n";
}

template<typename T, typename U>
istream &operator>>(istream &is, pair<T,U> &P){
    is >> P.first >> P.second;
    return is;
}

template<typename T, typename U>
ostream &operator<<(ostream &os, const pair<T,U> &P){
    os << P.first << " " << P.second;
    return os;
}

template<typename T>
istream &operator>>(istream &is, vector<T> &X){
    for (auto &x: X) is >> x;
    return is;
}

template<typename T>
ostream &operator<<(ostream &os, const vector<T> &X){
    int N=(int)len(X);
    rep(i,N) os << (i ? " ": "") << X[i];
    return os;
}

int main(){
    ll T,A,B,X,Y; input(T,X,A,Y,B);

    int K0,K1;
    if (T>0){
        K0=0;
        K1=floor(T,Y);
    }else{
        int T_abs=abs(T);
        K0=ceil(T_abs,B);
        K1=floor(B,Y)+ceil(T_abs,B);
    }

    ll Ans=1001001001001001001;
    for (int r:vector<int>{K0,K1}){
        ll q,p;
        tie (q,p)=divmod(T+r*B, A);
        chmin(Ans, p+q*X+r*Y);
    }

    print(Ans);
}