foo.c: In function 'main':
foo.c:5:10: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'long int *' [-Wformat=]
  scanf("%d",&n);
         ~^  ~~
         %ld
foo.c:4:13: warning: unused variable 's' [-Wunused-variable]
  long int i,s,F,f1,f2,n;
             ^
foo.c:5:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ^~~~~~~~~~~~~~

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