编译错误？？

#include<bits/stdc++.h>
using namespace std;
int n,a,s,b,x[100],y[100],max=0;
void dfs(int rest,int  num,int sum){
    if(num==n-1){
        if(sum>max)max=sum;
        return;
    }
    else{
        if(x[i]>a+b)dfs(rest,num+1,sum);
        else if(y[i]>s)dfs(rest,num+1,sum);
        else{
            dfs(rest,num+1,sum);
            dfs(rest-b[i],num+1,)
        } 
    }
}
int main(){
    cin>>n>>s>>a>>b;
    for(int i=0;i<n;i++)
    cin>>x[i]>>y[i];
    int max;
    dfs(s,1,0);
    cout<<max;
    return 0;
}