import Foundation


func readStr() -> String {
  return readLine()!
}

func readInt() -> Int {
    return Int(readLine()!)!
}

func readInts() -> [Int] {
    return readLine()!.split(separator: " ").map { Int($0)! }
}

func readTwoInts() -> (a: Int, b: Int) {
    let ints = readLine()!.split(separator: " ").map { Int($0)! }
    return (a: ints[0], b: ints[1])
}

print(readStr().map { Int(String($0))! }.reduce(0) { $0 + $1 } % 9 == 0 ? "Yes" : "No")
