Implementation
Python

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Please try to avoid dependencies to third-party libraries and frameworks.

Other implementations
import java.util.Scanner;
Scanner in = new Scanner(System.in);
n = in.nextInt();
read(n);
my $n = <> + 0;  # read a line from STDIN, add 0 to convert to int
#include <stdio.h>
#include <stdlib.h>
char inbuff[1000];

if (!fgets(inbuff, sizeof(inbuff), stdin))
   fabort("Can't read from input");
int n = atoi(inbuff);
printf("You entered %d\n", n);
#include <iostream>
std::cin >> n;
import std.stdio;
readf("%d", &n);
n <- (read :: String -> Int) <$> getContents
fscanf(STDIN, "%d\n", $n);
import "fmt"
_, err := fmt.Scan(&n)
n = gets.to_i
n = io.read("n")
fn get_input() -> String {
    let mut buffer = String::new();
    std::io::stdin().read_line(&mut buffer).expect("Failed");
    buffer
}

let x = get_input().trim().parse::<i64>().unwrap();
n = String.to_integer IO.gets ""
import "fmt"
_, err := fmt.Scanf("%d", &n)