用switch一拳轰烂

#include<iostream>
using namespace std;
int main(){
int x;
cin >> x;
switch(x){
case 1:
case 2:cout << 1;break;
case 3:cout << 2;break;
case 4:cout << 3;break;
case 5:cout << 5;break;
case 6:cout << 8;break;
case 7:cout << 13;break;
case 8:cout << 21;break;
case 9:cout << 34;break;
case 10:cout << 55;break;
}
}