import sys

# sys.setrecursionlimit(200005)
# sys.set_int_max_str_digits(200005)
int1 = lambda x: int(x)-1
pDB = lambda *x: print(*x, end="\n", file=sys.stderr)
p2D = lambda x: print(*x, sep="\n", end="\n\n", file=sys.stderr)
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LI1(): return list(map(int1, sys.stdin.readline().split()))
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def SI(): return sys.stdin.readline().rstrip()

dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
# inf = -1-(-1 << 31)
inf = -1-(-1 << 62)

# md = 10**9+7
md = 998244353

from heapq import *

class SlopeTrick:
    def __init__(self):
        self.mn = 0
        self.ll = [inf]
        self.rr = [inf]
        self.dl = [inf+1]
        self.dr = [inf+1]

    # 範囲x>=aにx-aを追加する
    def add_inc(self, x):
        while self.ll[0]==self.dl[0]:heappop(self.ll);heappop(self.dl)
        self.mn += max(0, -self.ll[0]-x)
        heappush(self.rr, -heappushpop(self.ll, -x))

    # 範囲x<=aに-x+aを追加する
    def add_dec(self, x):
        while self.rr[0]==self.dr[0]:heappop(self.rr);heappop(self.dr)
        self.mn += max(0, x-self.rr[0])
        heappush(self.ll, -heappushpop(self.rr, x))

    # 範囲x>=aからx-aを削除する
    def del_inc(self, x):
        while self.rr[0]==self.dr[0]:heappop(self.rr);heappop(self.dr)
        if x>=self.rr[0]:
            heappush(self.dr,x)
            return
        self.mn -= self.rr[0]-x
        heappush(self.dl,-x)
        heappush(self.ll, -heappop(self.rr))

    # 範囲x<=aから-x+aを削除する
    def del_dec(self, x):
        while self.ll[0]==self.dl[0]:heappop(self.ll);heappop(self.dl)
        if x<=-self.ll[0]:
            heappush(self.dl,-x)
            return
        self.mn -= x+self.ll[0]
        heappush(self.dr,x)
        heappush(self.rr, -heappop(self.ll))

    def get_min(self):
        return self.mn

n,k,d=LI()
hh=LI()
st=SlopeTrick()
for h in hh[:k-1]:
    st.add_inc(h)
    st.add_dec(h-d)
ans=inf
for i in range(k-1,n):
    h=hh[i]
    st.add_inc(h)
    st.add_dec(h-d)
    ans=min(ans,st.get_min())
    h=hh[i-k+1]
    st.del_inc(h)
    st.del_dec(h-d)
print(ans)