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pub fn Add(x: i64, y:i64)-> i64{
    let z=x+y;
    z

} 
pub fn Mul(x: i64, y:i64)->i64{
     let z=x*y;
    z
}
pub fn Div(x: i64, y:i64)->i64{
     let z=x/y;
    z
}
pub fn Sub(x: i64, y:i64)->i64{
     let z=x-y;
    z
}
pub fn Mod(x: i64, y:i64)->i64{
     let z=x%y;
    z
}