def kiriage(a, b): return (a+b-1)//b
N, M, T = map(int, input().split())
A = list(map(int, input().split()))
cnt = [0]*N
for a in A:
    cnt[a - 1] += 1

def solve(m): # m分以内に全て焼けるか？
    total = 0
    for c in cnt:
        if c > m:
            # c - m 枚を別オーブンに委託
            total -= c - m
        elif c == m:
            # このオーブン内で需給が簡潔
            pass
        else:
            total += kiriage(m - c, T)
    return total >= 0

ok = 10**18
ng = 0
while abs(ok - ng) != 1:
    mid = (ok + ng)//2
    if solve(mid):
        ok = mid
    else:
        ng = mid
print(ok)