1 #include <stdio.h>
 2 #include <string.h>
 3 
 4 struct Food
 5 {
 6     int a,b;
 7 }food[101];
 8 int dp[100005];
 9 
10 int max(int a,int b)
11 {
12     return a>b?a:b;
13 }
14 
15 int main()
16 {
17     int n,m;
18     int i,j;
19     while (scanf("%d",&n)!=EOF)
20     {
21         memset(dp,0,sizeof(dp));
22         for (i=1;i<=n;i++)
23             scanf("%d%d",&food[i].a,&food[i].b);
24         scanf("%d",&m);
25         for (i=1;i<=n;i++)
26         {
27             for (j=food[i].b;j<=m;j++)
28             {
29                 dp[j]=max(dp[j],dp[j-food[i].b]+food[i].a);
30             }
31         }
32         printf("%d\n",dp[m]);
33     }
34     return 0;
35 }