import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################


n, m, t = na()
a = na()
b = [0] * n
for i in range(m):
    b[a[i]-1] += 1

ok = 10 ** 18
ng = -1

while abs(ok - ng) > 1:
    mid = ok + ng >> 1

    S = 0
    T = 0
    for i in range(n):
        if b[i] >= mid:
            S += b[i] - mid
        else:
            T += (mid - b[i]) // t
    
    # print(mid, S, T)
    if T >= S:
        ok = mid
    else:
        ng = mid

print(ok)