function main(input) {
const args = input.split(' ');
const a = parseInt ( args[0] , 10 );
const b = parseInt ( args[1] , 10 );
console.log(Math.max( 2*a - 1 , a + b , 2*b - 1 ));
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));
