unsigned count_reversible(unsigned limit) {
unsigned counter = 0;
unsigned i;
for (i = 1; i < limit; ++i) {
if (is_reversible(i)) {
++counter;
}
}
return counter;
}
int
main(int argc, char *argv[])
{
int i;
int count;
for(i = 1, count=0;i<1000000000;++i) {
int is = is_reversible(i);
count += is;
}
printf("%d\n", count);
return 0;
}