A, B, C, D = map(int, input().split())
N = int(input())

M = 10**9+7

p = (N-1) % 8
n = (N-1) // 8

V = None
if p == 0:
    V = 2 * B
elif p == 1:
    V = 2 * (B - C)
elif p == 2:
    V = -4 * C
elif p == 3:
    V = -4 * (A + C)
elif p == 4:
    V = -8 * A
elif p == 5:
    V = -8 * (A - D)
elif p == 6:
    V = 16 * D
elif p == 7:
    V = 16 * (B - C)
    
V = (V + M) % M
V = (V * pow(16, n, M)) % M
    
print(V)