#include <cstdio>

using namespace std;

int w[5005], p[5005];
int dp[10005];

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

    int n, g, sol = 0;
    scanf("%d%d", &n, &g);

    for(int i = 1; i <= n; ++ i) {
        scanf("%d%d", &w[i], &p[i]);
    }

    for(int i = 1; i <= n; ++ i) {
        for(int j = g - w[i]; j >= 0; -- j) {
            if(dp[j + w[i]] < dp[j] + p[i]) {
                dp[j + w[i]] = dp[j] + p[i];
                if(dp[j + w[i]] > sol)
                    sol = dp[j + w[i]];
            }
        }
    }

    printf("%d", sol);

    return 0;
}