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0_0_19825181_16403.cpp:1:121: 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)?{??sum=n*(n+1)/2;??printf("%d\n\n",sum);?}?return 0;}
                                                                                                                         ^
compilation terminated.