import chn.util.*;
ConsoleIO input=new ConsoleIO();
int num, one=0, two=1, temp=0, count=0, next=1;
System.out.print("Number = ");
num=input.readInt();
while (count<num) {
	count++;
	temp=one;
	one=two;
	two=next;
	next=one+two;
}
System.out.println(next);