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0_0_16094643_18584.cpp:1:140: 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(){    unsigned int n;    while(scanf("%d",&n)!=EOF){        printf("%d/n",n*(n+1)/2);         printf("/n");    }}
                                                                                                                                            ^
compilation terminated.