static void Main(String[] args)
{
int n = Cin.NextInt();
int k = Cin.NextInt();
int[] t = new int[n];
for (int i = 0; i < n; i++)
{
t[i] = Cin.NextInt();
}
int a = 0;
int ans = 0;
for (int i = 0; i < n; i++)
{
for (int j = 1; j <= t[i]; j++)
{
int pp = a + (j + k - 1) / k;
if (pp == j)
{
ans++;
}
}
a += (t[i] + k - 1) / k;
}
Cout.Print(ans);
}
static void Main(String[] args)
{
int n = Cin.NextInt();
int k = Cin.NextInt();
int q = Cin.NextInt();
int[] ns = new int[n];
for (int i = 0; i < n; i++)
{
ns[i] = Cin.NextInt();
}
k %= n;
var res = ns;
if (k != 0)
{
var l = ns.ToList().GetRange(0, n - k).ToArray();
var r = ns.ToList().GetRange(n - k, k).ToArray();
res = r.Concat(l).ToArray();
}
for (int i = 0; i < q; i++)
{
int Q = Cin.NextInt();
Cout.Print(res[Q]);
}
}
static void Main(String[] args)
{
int T = Cin.NextInt();
for (int case_ = 0; case_ < T; case_++)
{
int n = Cin.NextInt();
int[] ns = new int[n];
for (int i = 0; i < n; i++)
{
ns[i] = Cin.NextInt();
}
int s = 0;
for (int i = 0; i < n; i++)
{
for (int j = 0; j < i; j++)
{
if (ns[j] > ns[i])
{
s++;
}
}
}
Cout.Print(s % 2 == 1? "NO": "YES");
}
}
static void Main(String[] args)
{
r = Cin.NextInt();
c = Cin.NextInt();
int n = Cin.NextInt();
int[,] board = new int[r, c];
for (int i = 0; i < r; i++)
{
var line = Cin.NextToken();
for (int j = 0; j < c; j++)
{
if (line[j] == '.')
{
board[i, j] = 0;
}
else
{
board[i, j] = 4;
}
}
}
int[,,] buffer = new int[r, c, 2];
for (int i = 0; i < r; i++)
{
for (int j = 0; j < c; j++)
{
buffer[i, j, 0] = board[i, j];
}
}
n = (n - 2) % 4 + 2;
int p = tick(buffer, 0, n);
for (int i = 0; i < r; i++)
{
for (int j = 0; j < c; j++)
{
Cout.Write(buffer[i, j, p] == 0? '.': 'O');
}
Cout.Print("");
}
}
static void Main(String[] args)
{
string[] tokens_n = Console.ReadLine().Split(' ');
int n = Convert.ToInt32(tokens_n[0]);
int k = Convert.ToInt32(tokens_n[1]);
string[] a_temp = Console.ReadLine().Split(' ');
int[] a = Array.ConvertAll(a_temp, Int32.Parse);
int ans = 0;
for (int i = 0; i < n; i++)
{
for (int j = i + 1; j < n; j++)
{
if ((a[i] + a[j]) % k == 0)
{
ans++;
}
}
}
Cout.Print(ans);
}
