14 lines
202 B
C++
14 lines
202 B
C++
#include<cstdio>
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#include<algorithm>
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using namespace std;
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long long a,b;
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int main()
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{
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#ifdef local
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freopen("pro.in","r",stdin);
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#endif
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scanf("%lld%lld",&a,&b);
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printf("%lld\n",a*b-a-b);
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return 0;
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}
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