//

const main = (standardInput) => {
    const numberList = standardInput.split(' ');
    const biggestNumber = Math.max.apply(null,numberList);
    const remaingNumber = numberList.filter(n => n !== biggestNumber);
    const sumNumber = remaingNumber.reduce(function(a, x){return a + x;});
    
    if (biggestNumber>sumNumber){
      console.log("No");
    }else{
      console.log("Yes");
    }

};

main(require('fs').readFileSync('/dev/stdin', 'UTF-8'));