R=range
N,K,s,a,b,m=map(int,input().split())
f=[s]
for i in R(2*N):f+=[(a*f[-1]+b)%m]
v=[[-9**18]for w in R(3)]
for i in R(N):v[f[i]%3]+=[-(f[i]%3+1)*f[i+N]]
for w in R(3):
	u=v[w]
	u.sort()
	u[0],b=0,len(u)
	for i in R(1,b):u[i]=u[i-1]-u[i]
	while b<3*K+3:
		u+=[u[-1]]
		b+=1
a=v[2][K]
for k in R(K):
	b=K-k
	l,r=0,b+1
	while l<r-1:
		m=(l+r)//2
		if v[1][m]-v[1][m-1]<v[0][3*b-2*m+2]-v[0][3*b-2*m]:r=m
		else:l=m
	a=max(a,v[2][k]+v[1][l]+v[0][3*b-2*l])
print(a)