P1, P2, Q1, Q2, T = map(int, input().split())

def inverse(n, d):
    return n * pow(d, -1, MOD) % MOD

MOD = 998244353

spawn = inverse(P1, P2)
dead = inverse(Q1, Q2)
D = [1]
for _ in range(T):
    D.append(D[-1]*dead%MOD)

dp = [[0]*(T+1) for _ in range(T+1)]
dp[0][0] = 1
for i in range(T):
    for j in range(T+1):
        if dp[i][j] == 0:
            continue
        dp[i+1][i+1] += dp[i][j]*spawn%MOD
        dp[i+1][i+1] %= MOD
        dp[i+1][j] += dp[i][j]*D[i+1-j]%MOD
        dp[i+1][j] %= MOD

print(sum(dp[-1])%MOD)