export {};
const input = require("fs").readFileSync(0).toString().trim().split("\n");

const [N, K]: number[] = input[0].split(" ").map(Number);
let items: number[][] = Array.from({length: N}, (_, i) => input[i+1].split(" ").map(Number));

let dp: number[] = Array(K+1).fill(0);

for(let [w,v] of items) {
    for(let k=K; k>=w; k--) {
        dp[k] = Math.max(dp[k-w] + v, dp[k]);
    }
}

console.log(dp[K]);