import java.util.Scanner;
public class Main {
public static void main
(String[] args
) { // считывание переменной n
Scanner scanner
= new Scanner
(System.
in); int n = scanner.nextInt();
// получение n-ого по счёту числа Фибоначчи
long a = 0;
long b = 1;
for (int i = 2; i <= n; ++i) {
long next = a + b;
a = b;
b = next;
}
// вывод n-ого по счёту числа Фибоначчи
}
}
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