美しいミズキ

1
const print := __fstdout_println;
2
const int_parse := __fvalue_int_parse;
3
const read := __fstdin_read;
4

5
var fib := [0, 1, 1];
6
var index := int_parse(read());
7

8
var flag := true;
9

10
func printResult(result)
11
{
12
    print("Result: ", result);
13
}
14

15
if index <= 3
16
{
17
    printResult(fib[index-1]);
18
    flag = false;
19
}
20

21
for (var i:=3;i < index + 1 and flag; i = i + 1)
22
{
23
    fib.push(fib[i-1] + fib[i-2]);
24
}
25

26
printResult(fib[index]);