import java.util.Scanner;
public class Main {
public static void main
(String[] args
) { Scanner sc
= new Scanner
(System.
in); int N = sc.nextInt();
long a = 0, b = 1;
for (int i = 1; i <= N; i++) {
if (i == 1) {
} else if (i == 2) {
} else {
long temp = a + b;
a = b;
b = temp;
}
}
sc.close();
}
}
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