fn sum(list:&Vec<i64>) -> i64 {
    let mut total = 0;
    for i in list {
        total += i;
    }
    total
}

fn main(){
    let mut v: Vec<i64> = Vec::new();
    v.push(1);
    v.push(2);
    v.push(3);
    for i in &v {
        println!("{}", i);
    }
    println!("Sum: {}", sum(&v));
}