```
int climbStairs(int n ){

    if(n==1){
        return 1;
    }
    if (n>=2){
         return (2+ climbStairs(n-2)+ climbStairs(n-1));
    }
}

```

[![enter image description here](https://i.stack.imgur.com/UGNHV.png)](https://i.stack.imgur.com/UGNHV.png)

How do I fix the compiler error?