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AtCoder ABC #067 [Rust]
use std::io;
use std::str::FromStr;
fn main() {
let stdin = io::stdin();
let mut buf = String::new();
stdin.read_line(&mut buf).ok();
let mut it = buf.split_whitespace()
.map(|n| i64::from_str(n).unwrap());
let (a, b) = (it.next().unwrap(), it.next().unwrap());
if a % 3 == 0 || b % 3 == 0 || (a + b) % 3 == 0 {
println!("Possible");
} else {
println!("Impossible");
}
}
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