foo.c: In function 'main':
foo.c:50:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   50 |     scanf("%d%d%d",&n1,&n2,&n3);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:53:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   53 |         scanf("%d",&a[i]);
      |         ^~~~~~~~~~~~~~~~~
foo.c:57:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   57 |         scanf("%d",&b[i]);
      |         ^~~~~~~~~~~~~~~~~
foo.c:61:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   61 |         scanf("%d",&c[i]);
      |         ^~~~~~~~~~~~~~~~~

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