class Library{ void printi(int i) {} void println(string s) {} int stoi(string s, int error) {} } class Fibonacci { void main(string[] args) { string s = args[0]; int n = stoi(s,-1); int r = fib(n); Library.printi(r); Library.println(""); } int fib(int n) { if (n < 2) return n; return fib(n-1) + fib(n-2); } }