function main(input){
    input = input.split(' ');
    inputK = parseInt(input[0]);
    inputX = parseInt(input[1]);
    out = '';

    if(500*inputK>inputX){
        out = 'Yes';
    }
    else if(500*inputK<inputX){
        out = 'No';
    }

    console.log(out);
}

main(require("fs").readFileSync("/dev/stdin", "utf8"));