import sys
input = sys.stdin.readline

mod=998244353
P1,P2,Q1,Q2,T=map(int,input().split())

DP=[0]*(T+1)
DP[0]=1

P=P1*pow(P2,mod-2,mod)%mod
Q=Q1*pow(Q2,mod-2,mod)%mod

for i in range(T):
    NDP=[0]*(T+1)

    for j in range(T):
        NDP[0]=(NDP[0]+DP[j]*P)%mod
        NDP[j+1]=(NDP[j+1]+DP[j]*pow(Q,j+1,mod))%mod

    DP=NDP
        
print(sum(DP)%mod)