N,K = map(int,input().split())
A = list(map(int,input().split()))
def matmul(X,Y):
    Z = [[0 for _ in range(N)] for _ in range(N)]
    for i in range(N):
        for j in range(N):
            for k in range(N):
                Z[i][j] = Z[i][j]^(X[i][k]*Y[k][j])
    return Z
I = [[0 for _ in range(N)] for _ in range(N)]
for i in range(N):
    for j in range(N):
        if i==j:
            I[i][j] = 1
def matpow(X,k):
    if k==0:
        return I
    if k==1:
        return X
    if k%2==0:
        return matmul(matpow(X,k//2),matpow(X,k//2))
    Y = matmul(matpow(X,(k-1)//2),matpow(X,(k-1)//2))
    return matmul(X,Y)
T = N+1
M = (K-1)%T
A1 = [[0 for _ in range(N)] for _ in range(N)]
for i in range(N-1):
    A1[i][i+1] = 1
for j in range(N):
    A1[N-1][j] = 1
B = matpow(A1,M)
ans = 0
for i in range(N):
    ans = ans^(B[0][i]*A[i])
print(ans)