#include <stdio.h>
int main() {
int x;
if (x>=90 )
else if ( x>=80 )
else if ( x>=60 )
else
return 0;
}
I2luY2x1ZGUgPHN0ZGlvLmg+CgppbnQgbWFpbigpIHsKCWludCB4OwoJc2NhbmYoIiVkIiwmeCk7CglpZiAoeD49OTAgICAgICAgKQoJCXByaW50ZigiUyAgXG4iKTsKCWVsc2UgaWYgKCB4Pj04MCAgICAgICkKCQlwcmludGYoIkEgIFxuIik7CgllbHNlIGlmICggeD49NjAgICAgICApCgkJcHJpbnRmKCJCICBcbiIpOwoJZWxzZQoJCXByaW50ZigiRCAgXG4iKTsKCXJldHVybiAwOwp9Cg==