uses io.printi, io.printc, conv.stoi

function main : (array[string] args) -> int {
	 string s = args[0];
	 int n = stoi(s,0);

	 int r = fib(n);
	 
	 printi(r);
	 printc(10);

	 return 0;
}

function fib : (int n) -> int {
	 if (n < 2) return n;
	 return fib(n-1) + fib(n-2);
}