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0_0_19808954_31225.cpp:1:209: fatal error: GCC4.9.2/lib/gcc/x86_64-w64-mingw32/4.9.2/include/stdio.h>in: Invalid argument
 #include<stdio.h>int main(){    int n,sum;    while(scanf("%d",&n)!=EOF)    {        if(n%2==0)            sum=n/2*(n+1);         else            sum=(n+1)/2*n;        printf("%d\n\n",sum);    }    return 0;}
                                                                                                                                                                                                                 ^
compilation terminated.