energy = 100 #initial energy
i = k % n #initial jump from 0
energy -= c[i] * 2 + 1 #initial energy loss
while i != 0:
    i = (i + k) % n
    energy -= c[i] * 2 + 1
    
print energy

n, k  = map(int, input().strip().split())
clouds = list(map(int, input().strip().split()))
print(100 - sum(1 + 2 * clouds[i] for i in range(0, n, k)))

print((lambda x,y: 100-sum(1+2*y[i] for i in range(0,x[0],x[1])))(list(map(int,input().strip().split())), list(map(int,input().strip().split()))))

def jumpingOnClouds(c, k):
    energy=100
    pos=0
    n=len(c)
    while True:
        pos=(pos+k)%n
        if c[pos]==1:
            energy-=3
        else:
            energy-=1
        
        if pos==0:
            break
    return energy