0_0_24261405_993.cpp: In function 'int main()':
0_0_24261405_993.cpp:4:11: error: 'cin' was not declared in this scope
while(cin>>n){
^
0_0_24261405_993.cpp:5:9: error: 'cout' was not declared in this scope
cout<<1LL*n*(n+1)/2<<endl;
^
0_0_24261405_993.cpp:5:30: error: 'endl' was not declared in this scope
cout<<1LL*n*(n+1)/2<<endl;
^
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