17 lines
194 B
C++
17 lines
194 B
C++
#include<cstdio>
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using namespace std;
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int main()
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{
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int n;
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long long ans=0,times=1;
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scanf("%d",&n);
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for(int i=1;i<=n;i++)
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{
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times*=i;
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ans+=times;
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}
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printf("%lld\n",ans);
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return 0;
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}
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