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#include <bits/stdc++.h>
using namespace std;
const int N = 1010;
int n, m;
int f[N];
// 完全背包问题
int main() {
//文件输入
freopen("ZhiDuo_WQ.in", "r", stdin);
scanf("%d %d", &n, &m);
for (int i = 1; i <= n; i++) {
int v, w;
scanf("%d %d", &v, &w);
for (int j = v; j <= m; j++) //一个一个加上来,求一个最大值
f[j] = max(f[j], f[j - v] + w);
}
printf("%d\n", f[m]);
return 0;
}