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#include <stdio.h>
#define MAX_SIZE 100

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

int is_empty() {
    return top == -1;
}

int is_full() {
    return top == MAX_SIZE - 1;
}

void push(int item) {
    if (is_full()) {
        printf("Stack overflow\n");
        return;
    }
    stack[++top] = item;
}

int pop() {
    if (is_empty()) {
        printf("Stack underflow\n");
        return -1;
    }
    return stack[top--];
}

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

int size() {
    return top + 1;
}

int main() {
    push(10);
    push(20);
    push(30);
    printf("Peek: %d\n", peek());    // Output: 30
    printf("Pop: %d\n", pop());      // Output: 30
    printf("Pop: %d\n", pop());      // Output: 20
    printf("Size: %d\n", size());    // Output: 1
    printf("Is empty? %s\n", is_empty() ? "Yes" : "No");  // Output: No

    return 0;
}