JAva階段登りアルゴリズム実装

public class Run {

public static void main(String[] args) {
//startUp()     ，    ，     5
System.out.println(startUp(5));
}

public static int startUp(int n){
if(n ==3)
return 4;
if(n <3)
return n;
return startUp(n-1) + startUp(n-2) + startUp(n-3);
}

}

    static int getCount(int level){
        switch(level){
            case 1:
                return 1;
            case 2:
                return 2;
            case 3:
                return 4;
        }

        int count = 0;
        for (int i = 0; i < level; i++) {
            count += getCount(i);
        }
        return count;

    }