foo.c: In function 'main':
foo.c:40:15: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  int b1,b2,b3;scanf("%d%d%d",&b1,&b2,&b3);
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:43:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&a1[i]);
   ^~~~~~~~~~~~~~~~~~
foo.c:47:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&a2[i]);
   ^~~~~~~~~~~~~~~~~~
foo.c:51:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&a3[i]);
   ^~~~~~~~~~~~~~~~~~

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