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#define MaxSize 100
#define ElemType int

typedef struct {
    ElemType stack[MaxSize];
    int top[2];
} ShareStack;

ShareStack s;

int Push(ElemType e, int stackNum) {
    if (stackNum < 0 || stackNum > 1) {
        return 0;
    }
    if (s.top[1] - s.top[0] == 1) return 0;
    switch (stackNum) {
        case 0:
            s.stack[++s.top[0]] = e;
            break;
        case 1:
            s.stack[--s.top[1]] = e;
    }
    return 1;
}

ElemType Pop(int stackNum) {
    if (stackNum < 0 || stackNum > 1) {
        return 0;
    }
    if (s.top[1] - s.top[0] == 1) return 0;
    switch (stackNum) {
        case 0:
            if (s.top[0] == 0)return 0;
            return s.stack[s.top[0]--];
        case 1:
            if (s.top[1] == MaxSize)return 0;
            return s.stack[s.top[1]++];
    }
}