T = int(input())
X,A = map(int,input().split())
Y,B = map(int,input().split())
S = set()
if T>=0:
    ans = (T//A)*(X-A)+T
    n = T//A+1
    while True:
        m = (n*A-T+B-1)//B
        if T-n*A+m*B in S:break
        ans = min(ans,T-n*(A-X)+m*(Y+B))
        S.add(T-n*A+m*B)
        n += 1
else:
    T = abs(T)
    m = (T+B-1)//B
    ans = m*(Y+B)-T
    S.add(m*B-T)
    n = 1
    while True:
        m = (n*A+T+B-1)//B
        if m*B-n*A-T in S:break
        ans = min(ans,m*(Y+B)-n*(A-X)-T)
        S.add(m*B-n*A-T)
        n += 1
print(ans)