ccf201703-1分蛋糕(python100分)

n,k=list(map(int,input().split()))
a=list(map(int,input().split()))
count=0
sum=0
for i in range(n):
    sum+=a[i]
    if(sum>=k):
        count+=1
        sum=0
    else :
        if(i==n-1):
            count+=1
print(count)