/in/foo.c: In function 'main':
/in/foo.c:10:19: error: expected expression before 'return'
  else n++,s=s+1/n,return loop;
                   ^~~~~~
/in/foo.c:9:2: warning: label 'loop' defined but not used [-Wunused-label]
  loop:if(s>k)printf("%d",n);
  ^~~~