#include <stdio.h>
int fib(int x)
{
if(x==0)
return 0;
else if(x==1)
return 1;
else
return fib(x-1)+fib(x-2);
}
int main(void) {
int a,n;
a=fib(n);
return 0;
}
I2luY2x1ZGUgPHN0ZGlvLmg+CmludCBmaWIoaW50IHgpCnsKICAgIGlmKHg9PTApCiAgICAgICAgcmV0dXJuIDA7CiAgICBlbHNlIGlmKHg9PTEpCiAgICAgICAgcmV0dXJuIDE7CiAgICBlbHNlCiAgICAgICAgcmV0dXJuIGZpYih4LTEpK2ZpYih4LTIpOwp9CgppbnQgbWFpbih2b2lkKSB7CglpbnQgYSxuOwogICAgc2NhbmYoIiVkIiwmbik7CiAgICBhPWZpYihuKTsKICAgIHByaW50ZigiJWQiLGEpOwoJcmV0dXJuIDA7Cn0K