from sys import stdin,stdout
nmbr = lambda: int(input())
lst = lambda: list(map(int, input().split()))
def ceil(nn,dd):
    fl=nn//dd
    if dd*fl<nn:fl+=1
    return fl


for _ in range(1):#nmbr()):
    # n=nmbr()
    n,extra,d=lst()
    a=sorted(lst())
    b=[]
    for i in range(1,n):
        if a[i]-a[i-1]>d:
            req=ceil(a[i]-a[i-1],d)+1
            b+=[req-2]
    b.sort()
    sm=c=0
    ans=len(b)+1
    # print(b)
    for v in b:
        if sm+v>extra:break
        sm+=v
        c+=1
    print(ans-c)