/in/foo.c:4:5: error: expected identifier or '(' before 'while'
     while(scanf("%d",&N)!=EOF)
     ^~~~~
/in/foo.c:25:5: error: expected identifier or '(' before 'return'
     return 0;
     ^~~~~~
/in/foo.c:26:1: error: expected identifier or '(' before '}' token
 }
 ^