#include <iostream>
using namespace std;
int main() {
int n;
int fibo[40];
fibo[0] = 0;
fibo[1] = 1;
while (scanf("%d", &n) != EOF) { // 注意 while 处理多个 case
for(int i = 2; i <= n; i++){
fibo[i] = fibo[i - 1] + fibo[i - 2];
}
printf("%d\n", fibo[n]);
}
}
// 64 位输出请用 printf("%lld")

京公网安备 11010502036488号