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18 lines
294 B
18 lines
294 B
using namespace std;
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#include <iostream>
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int main() {
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int k, n, total_cost;
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total_cost = 0;
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long w;
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cin >> k >> n >> w;
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for (int i = 1; i < w + 1; i++) {
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total_cost += i * k;
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}
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total_cost -= n;
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if (total_cost < 0) {
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total_cost = 0;
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}
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cout << total_cost << endl;
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}
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