#include <stdio.h>

int stack[4];
int top = -1;

void push(int element) {
    if (top == 4 - 1) {
        printf("Stack Overflow\n");
    } else {
        stack[++top] = element;
        printf("Pushed is: %d \n", element);
    }
}

void pop() {
    if (top == -1) {
        printf("Stack Underflow\n");
    } else {
        printf("Popped is: %d \n", stack[top--]);
    }
}

int peek() {
    if (top == -1) {
        printf("Stack is empty\n");
        return -1;
    } else {
        return stack[top];
    }
}

int main() {
    //!showArray(stack)
    push(10);
    push(20);
    push(30);
    push(40);
    push(50);
    printf("Top Element is: %d\n", peek());
    pop();
    pop();
    pop();
    pop();
    pop();
    printf("Top Element is: %d\n", peek());
    return 0;
}