#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int fib(int n)
{
	int a = 1;
	int b = 1;
	int c = 0;
	if (n <= 2)
		return 1;
	else
	{
		while (n>2)
		{
			c = a + b;
			a = b;
			b = c;
			n--;
		}
		return c;
	}
}
int main()
{
	int n = 0;
	int ret = 0;
	scanf("%d", &n);
	ret = fib(n);
	printf("%d", ret);
	system("pause");
	return 0;
}
 

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