A,B,C,D = map(int,input().split())
N = int(input())
MOD = 10**9+7
q = (N-1)//4
r = (N-1)%4
if r==0:
    if q%2==0:
        ans = (2*pow(4,q,MOD)*B)%MOD
    else:
        ans = (-2*pow(4,q,MOD)*A)%MOD
elif r==1:
    if q%2==0:
        ans = (2*pow(4,q,MOD)*(B-C))%MOD
    else:
        ans = (-2*pow(4,q,MOD)*(A-D))%MOD
elif r==2:
    if q%2==0:
        ans = (-pow(4,q+1,MOD)*C)%MOD
    else:
        ans = (pow(4,q+1,MOD)*D)%MOD
else:
    if q%2==0:
        ans = (-pow(4,q+1,MOD)*(A+C))%MOD
    else:
        ans = (pow(4,q+1,MOD)*(B+D))%MOD
print(ans)