N,M,T = map(int,input().split())

A = list(map(int,input().split()))

B = [0] * N
for v in A:
    B[v-1] += 1


L = 0
R = 10**15

while R-L != 1:

    M = (L+R)//2

    over = 0
    remain = 0
    for i in range(N):
        if B[i] > M:
            over += B[i] - M
        else:
            remain += (M-B[i]) // T

    if over <= remain:
        R = M
    else:
        L = M


print (R)