#include <cstdio>
#include <cstring>
#define max(a,b) (a > b ? a : b)
using namespace std;

const int nmx = 5005;
const int mx = 10005;
const int inf = 0x3f3f3f3f;

int n, m, val[nmx], g[nmx], dp[mx];

int main(){
    freopen("rucsac.in", "r", stdin);
    freopen("rucsac.out", "w", stdout);

    scanf("%d %d", &n, &m);
    for(int i = 1; i <= n; ++i)
        scanf("%d %d", &g[i], &val[i]);

    for(int i = 1; i <= n; ++i)
        for(int j = m; j >= g[i]; --j)
            dp[j] = max(dp[j], dp[j-g[i]] + val[i]);


    printf("%d\n", dp[m]);

    return 0;
}