9 lines
171 B
C++
9 lines
171 B
C++
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#include <bits/stdc++.h>
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using namespace std;
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typedef long long LL;
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int main() {
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LL a, b;
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cin >> a >> b;
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cout << (a - 1) * (b - 1) - 1 << endl;
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return 0;
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}
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