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#include <iostream>
using namespace std;
int main()
{
int n, m, l, e, k, ma = 0, na = 0, la = 0, io = 0;
cin >> n >> m >> l >> k;
e = k * 2;
if (e <= n&&e<=m&&e<=l) {
io = 0;
cout << 0;
}
if (e > n) {
na = e - n;
}
if (e > m) {
ma = e - m;
}
if (e > l) {
la = e - l;
}
cout << na + ma + la;
}
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