#include <stdio.h>
#include <stdlib.h>


struct stack {
    int data;
    struct stack *next;
};
struct stack *top = NULL;

int size = 0;

struct stack *createNode(int data) {
    struct stack *newNode = (struct stack *) malloc(sizeof(struct stack));
    newNode->data = data;
    newNode->next = NULL;
    return newNode;
}
void push(int data) {
    struct stack *newNode = createNode(data);
    newNode->next = top;
    top = newNode;
    size++;
}
int getSize() {
    return size;
}

int getTop() {
    if (top == NULL) {
        printf("Stack is empty.\n");
        return -1;
    }
    return top->data;
}
int main() {
    int a,b,c;
    scanf("%d",&a);
    push(a);
    scanf("%d",&b);
    push(b);
    scanf("%d",&c);
    push(c);
    printf("Size: %d\n", getSize());
    printf("Top: %d\n", getTop());


}