foo.c: In function 'main':
foo.c:6:2: error: unknown type name '__int64'; did you mean '__int64_t'?
  __int64 x,y;
  ^~~~~~~
  __int64_t
foo.c:8:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ^~~~~~~~~~~~~~
foo.c:11:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%I64d",&y);
   ^~~~~~~~~~~~~~~~~

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