include<stdio.h>

include<stdlib.h>

define size 100

define stackextrasize 10

define ElemType int

typedef struct {
ElemType *base;
ElemType *top;
int stacksize;
}stack;
void InitStack(stack *s){
s->base=(ElemType )malloc(sizesizeof(ElemType));
if(!s->base){
exit(0);
}
s->top=s->base;
s->stacksize=size;
}
void Push(stack *s,ElemType e){
if(s->top-s->bases->stacksize){
exit(0);
}
*s->top++=e;
}
void Pop(stack *s,ElemType *e){
if(s->tops->base){
exit(0);
}
e=--s->top;
}
int main(){
stack s;int i,e,x;
InitStack(s);
scanf("%d",&e);
Push(s,e);
Pop(s,&e);
printf("%d",e);
//printf("%d",--s->top);
return 0;
}