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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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