A, B, C, D = map(int, input().split())
N = int(input())
MOD = 10**9+7
p = pow(16, N//8, MOD)

if N%8==0:
    print(p*(B+D)%MOD)
elif N%8==1:
    print((2*p*B)%MOD)
elif N%8==2:
    print(2*p*(B-C)%MOD)
elif N%8==3:
    print(-4*p*C%MOD)
elif N%8==4:
    print(-4*p*(A+C)%MOD)
elif N%8==5:
    print(-8*p*C%MOD)
elif N%8==6:
    print(8*p*(D-A)%MOD)
else:
    print(16*p*D%MOD)