#include <stdio.h>

int main()
{   int n,s,i;
    int top=-1;
    void push(int val)
    {   int stack[top];
        top++;
        stack[top]=val;
        printf("%d ",val);
    }
    
int main()
{
    int n;
    scanf("%d",&n);
    int val;
    
    push(10)
    push(20)
    push(30)
    push(40)
    push(50)
    if(n<0)
    {
        printf("Invalid Input");
    }
    return 0:
}