#include<stdio.h>
#define max 10
int front=0,rear=-1;
int queue[max];

void enqueue(int val)
{
    rear++;
    queue[rear]=val;
}
void dequeue()
{
    front++;
}
void peek()
{
    queue[front]=val;
    printf("%d",val);
}
int main()
{
    int n,val;
    scanf("%d",&n);
    enqueue(1);
    enqueue(2);
    enqueue(3);
    dequeue();
    peek();
    return 0;
}