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#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int main()
{
int l, r, b, k;
cin >> l >> r >> b >> k;
int ans = 0;
int flag = false;
if (l <= b)
ans = b * k;
else
{
for (int i = l; i <= r; i++)
{
if (i % b == 0)
{
ans = i * k;
flag = true;
break;
}
}
if (!flag)
{
ans = ceil(1.0 * l / b) * b * k;
}
}
cout << ans << "\n";
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