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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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//cin读入优化
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std::ios::sync_with_stdio(false);
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int a1, a2, n;
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cin >> a1 >> a2 >> n;
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cout << a1 + (a2 - a1) * (n - 1) << endl;
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return 0;
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} |
