#include <stdio.h>
int main() {
int x;
if (90<=x)
else if ( 80<=x)
else if (60<=x)
else
return 0;
}
I2luY2x1ZGUgPHN0ZGlvLmg+CgppbnQgbWFpbigpIHsKCWludCB4OwoJc2NhbmYoIiVkIiwmeCk7CglpZiAoOTA8PXgpCgkJcHJpbnRmKCIgUyBcbiIpOwoJZWxzZSBpZiAoIDgwPD14KQoJCXByaW50ZigiIEEgXG4iKTsKCWVsc2UgaWYgKDYwPD14KQoJCXByaW50ZigiQlxuIik7CgllbHNlCgkJcHJpbnRmKCIgRFxuIik7CglyZXR1cm4gMDsKfQo=