N,M=map(int,input().split())
A=[int(i) for i in input().split()]
streak=0
wa=0
odds=[]
for a in A:
    if a%2:#odd
        if streak==0:
            streak+=1
            wa+=a
        else:
            streak+=1
            wa+=a
    else:
        if streak>=M:
            print(wa)
        streak=0
        wa=0
if streak>=M:print(wa)