MOD = 998244353

p1,p2,q1,q2, t = map(int, input().split())

p = p1 * pow(p2, MOD-2, MOD) % MOD
q = q1 * pow(q2, MOD-2, MOD) % MOD

dp = [0 for i in range(t+1)]
dp[0] = 1

qlist = [1]
temp = q
for i in range(t):
    qlist.append(temp)
    temp *= q
    temp %= MOD

ans = 0
for i in range(t):
    cell = dp[i]

    for j in range(i+1, t+1):
        dp[j] += cell * p % MOD
        dp[j] %= MOD

        cell *= qlist[j-i]
        cell %= MOD

    
    ans += cell
    ans %= MOD


ans += dp[t]
ans %= MOD
# print(dp)
print(ans)