import java.math.BigInteger;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String str = sc.nextLine();
String[] strs = str.trim().split(\"\\\\s{1,}\");
int[] arr = new int[strs.length];
BigInteger[] b = new BigInteger[201];
b[0] = BigInteger.valueOf(0);
b[1] = BigInteger.valueOf(1);
b[2] = BigInteger.valueOf(2);
for(int i = 3; i < b.length;i++) {
b[i] = b[i-1].add(b[i-2]);
}
for (int i = 0; i < strs.length; i++) {
arr[i]= Integer.parseInt(strs[i]);
if (arr[i]>=1 && arr[i]<=200) {
System.out.println(b[arr[i]]);
}else {
System.out.println();
}
}
}
}
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