import core.bitop, std.algorithm, std.ascii, std.bigint, std.conv, std.math,
    std.functional, std.numeric, std.range, std.stdio, std.string, std.random,
    std.typecons, std.container, std.format;

// dfmt off
T lread(T = long)(){return readln.chomp.to!T();}
T[] aryread(T = long)(){return readln.split.to!(T[])();}
void scan(TList...)(ref TList Args){auto line = readln.split();
foreach (i, T; TList){T val = line[i].to!(T);Args[i] = val;}}
alias sread = () => readln.chomp();enum MOD = 10 ^^ 9 + 7;
// dfmt on

void main()
{
    long N, C, K;
    scan(N, C, K);
    auto T = new long[](N);
    foreach (i; 0 .. N)
        scan(T[i]);
    sort(T);
    long remain;
    long time;
    long ans;
    foreach (i; 0 .. N)
    {
        if (remain == 0)
        {
            ans++;
            remain = C - 1;
            time = T[i] + K;
        }
        else if (T[i] < time)
        {
            remain--;
        }
        else
        {
            ans++;
            remain = C - 1;
            time = T[i] + K;
        }
    }
    writeln(ans);
}
