#include <bits/stdc++.h>
using namespace std;


class InParser {
private:
	FILE *fin;
	char *buff;
	int sp;

	char read_ch() {
		++sp;
		if (sp == 4096) {
			sp = 0;
			fread(buff, 1, 4096, fin);
		}
		return buff[sp];
	}

public:
	InParser(const char* nume) {
		fin = fopen(nume, "r");
		buff = new char[4096]();
		sp = 4095;
	}

	InParser& operator >> (int &n) {
		char c;
		while (!isdigit(c = read_ch()) && c != '-');
		int sgn = 1;
		if (c == '-') {
			n = 0;
			sgn = -1;
		} else {
			n = c - '0';
		}
		while (isdigit(c = read_ch())) {
			n = 10 * n + c - '0';
		}
		n *= sgn;
		return *this;
	}
};


class OutParser {
private:
    FILE *fout;
    char *buff;
    int sp;

    void write_ch(char ch) {
        if (sp == 50000) {
            fwrite(buff, 1, 50000, fout);
            sp = 0;
            buff[sp++] = ch;
        } else {
            buff[sp++] = ch;
        }
    }


public:
    OutParser(const char* name) {
        fout = fopen(name, "w");
        buff = new char[50000]();
        sp = 0;
    }
    ~OutParser() {
        fwrite(buff, 1, sp, fout);
        fclose(fout);
    }

    OutParser& operator << (int vu32) {
        if (vu32 <= 9) {
            write_ch(vu32 + '0');
        } else {
            (*this) << (vu32 / 10);
            write_ch(vu32 % 10 + '0');
        }
        return *this;
    }
};

int dp[2][5001], w[5001], p[5001];


int main() {
    InParser cin("rucsac.in");
    OutParser cout("rucsac.out");
    int n, g;
    cin >> n >> g;
    for(int i = 1; i <= n; i++)
        cin >> w[i] >> p[i];
    for(int i = 1; i <= n; i++) {
        for(int j = 1; j <= g; j++) {
            if(w[i] > j)
                dp[i%2][j] = dp[(i-1)%2][j];
            else
                dp[i%2][j] = max(dp[(i-1)%2][j], dp[(i-1)%2][j-w[i]] + p[i]);
        }
    }
    cout << dp[n%2][g];
}