学步园

#include<iostream>
#include<cstdio>
using namespace std;
inline int read(){
    int x=0,f=1;char ch=getchar();
    while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
    while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}
    return x*f;
}
int n,bgn,mx,a[51];
bool f[51][1001];
int main(){
    n=read();bgn=read();mx=read();
    for(int i=1;i<=n;i++)a[i]=read();
    f[0][bgn]=1;
    for(int i=1;i<=n;i++)
        for(int j=0;j<=mx;j++){
            if(j-a[i]>=0&&f[i-1][j-a[i]])f[i][j]=1;
            if(j+a[i]<=mx&&f[i-1][j+a[i]])f[i][j]=1;
        }
    for(int i=mx;i>=0;i--)
        if(f[n][i]){printf("%d",i);return 0;}
    printf("-1");
    return 0;
}