"use strict"

function main(input) {
  input = input.split(" ").map(v => ~~v)

  const N = input[0] //100
  const M = input[1] // 5
  let b = (N - M) * 100 //ms // 95

  let a = 1 / Math.pow(0.5, M) //32
  // console.log((1900 * M + b) * a)
  console.log(1900 * M * a + b * a)
  // console.log(a, b, a * b, 608000 - a * b, a * 1900, a * 1900 + a * b)
}
main(require("fs").readFileSync("/dev/stdin", "utf8"))