foo.c: In function 'main':
foo.c:6:11: warning: format '%ld' expects argument of type 'long int *', but argument 2 has type 'long long int *' [-Wformat=]
  scanf("%ld %ld %ld %ld",&a,&b,&c,&d);
         ~~^              ~~
         %lld
foo.c:6:15: warning: format '%ld' expects argument of type 'long int *', but argument 3 has type 'long long int *' [-Wformat=]
  scanf("%ld %ld %ld %ld",&a,&b,&c,&d);
             ~~^             ~~
             %lld
foo.c:6:19: warning: format '%ld' expects argument of type 'long int *', but argument 4 has type 'long long int *' [-Wformat=]
  scanf("%ld %ld %ld %ld",&a,&b,&c,&d);
                 ~~^            ~~
                 %lld
foo.c:6:23: warning: format '%ld' expects argument of type 'long int *', but argument 5 has type 'long long int *' [-Wformat=]
  scanf("%ld %ld %ld %ld",&a,&b,&c,&d);
                     ~~^           ~~
                     %lld
foo.c:11:12: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'long long int' [-Wformat=]
  printf("%ld\n", ans);
          ~~^
          %lld
foo.c:6:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%ld %ld %ld %ld",&a,&b,&c,&d);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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