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#include <bits/stdc++.h>
using namespace std;
const int N = 10010;
int n, m, f[N][N];
int main() {
// 文件输入
freopen("2_QiaHaoFill.in", "r", stdin);
while (cin >> n >> m) {
memset(f, -0x3f, sizeof(f)); // 其它位置全部初始化为-INF
for (int i = 0; i < N; i++) f[i][0] = 0; // 第一列初始化为0
for (int i = 1; i <= n; i++) {
int v, w;
cin >> v >> w;
for (int j = v; j <= m; j++)
f[i][j] = max(f[i][j], f[i - 1][j - v] + w);
}
if (f[n][m] < 0)
puts("-1");
else
printf("%d\n", f[n][m]);
}
return 0;
}