14 lines
172 B
C++
14 lines
172 B
C++
#include <iostream>
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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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cin>>n;
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int s=0;
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for(int i=1;i<=n;i++){
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s+=i;
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}
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cout<<s<<endl;
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return 0;
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}
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