#include <stdio.h>
int main (){
int a,b;
switch(a){
case 1:
if((20<=b&&b<=30))
else if((1<=b)&&(b<=19))
}
return 0;}
I2luY2x1ZGUgPHN0ZGlvLmg+CmludCBtYWluICgpewogICAgaW50IGEsYjsKICAgIHNjYW5mKCIlZCIsJmEpOwogICAgc2NhbmYoIiVkIiwmYik7CiAgICBwcmludGYoIiVk5pyIJWTml6UiLGEsYik7CiAgICBzd2l0Y2goYSl7CiAgICAgICAgY2FzZSAxOgogICAgICAgICAgICBpZigoMjA8PWImJmI8PTMwKSkKICAgICAgICAgICAgcHJpbnRmKCLmsLTnk7bluqciKTsKICAgICAgICAgICAgZWxzZSBpZigoMTw9YikmJihiPD0xOSkpCiAgICAgICAgICAgcHJpbnRmKCLlsbHnvorluqciKTsKICAgIH0KICAgIHJldHVybiAwO30K