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

#define LINEL 32
#define STACK 2000
#define MAXIN 200000
#define MAXVAL 1000000000

struct instr {
	char op;
	int val;
};

int stack[STACK];
struct instr prg[MAXIN];
int inputs[MAXIN], ninp, i;
int err;
int stackptr;



int pop()
{
	if (stackptr < 1) {
		err = 1;
		return INT_MAX;
	}
	return stack[--stackptr];
}

int check_val(long long v)
{
	if (v > (long long)MAXVAL || v < -(long long)MAXVAL)
		err = 1;
	return v;
}


void push(int v)
{
	check_val(v);
	stack[stackptr++] = v;
}


int check_div(int d)
{
	if (!d) {
		err = 1;
		return 1;
	}
	return d;
}

void ex(int input)
{
	int i=0;
	int r0, r1;
	stackptr = 1;
	stack[0] = input;
	err = 0;
	while (1) {
		switch (prg[i].op) {
			case 'N':
				push(prg[i].val);
				break;
			case 'P':
				pop();
				break;
			case 'I':
				push(-pop());
				break;
			case 'D':
				r0 = pop();
				push(r0); push(r0);
				break;
			case 'W':
				r0 = pop();
				r1 = pop();
				push(r0);
				push(r1);
				break;
			case 'A':
				push(pop()+pop());
				break;
			case '-':
				r0 = pop();
				r1 = pop();
				push(r1-r0);
				break;
			case '*':
				push(check_val((long long)pop()*(long long)pop()));
				break;
			case '/':
				r0 = pop();
				r1 = pop();
				push(r1/check_div(r0));
				break;
			case '%':
				r0 = pop();
				r1 = pop();
				push(r1%check_div(r0));
				break;
			case 0:
				if (err || stackptr != 1)
					printf("ERROR\n");
				else
					printf("%d\n", stack[0]);
				
				return;
		}
		/*printf("OP: %c; SP: %d\n", prg[i].op, stackptr);*/
		if (err) {
			printf("ERROR\n");
			return;
		}
		i++;
	}
}


int main(void)
{
	
	struct instr *prp = prg;
	char riadok[LINEL];
	
	while (1) {
		fgets(riadok, LINEL, stdin);
		if (riadok[0]=='Q') break;
		switch (riadok[0]) {
			case 'N':
				prp->op = 'N';
				(prp++)->val = atoi(riadok + 4);
				break;
			case 'P':
			case 'I':
			case 'A':
				(prp++)->op = riadok[0];
				break;
			case 'D':
				if (riadok[1]=='U')
					(prp++)->op = 'D';
				else
					(prp++)->op = '/';
				break;
			case 'M':
				if (riadok[1]=='U')
					(prp++)->op = '*';
				else
					(prp++)->op = '%';
				break;
			case 'S':
				if (riadok[1]=='W')
					(prp++)->op = 'W';
				else
					(prp++)->op = '-';
				break;
			case 'E':
				(prp++)->op = 0;
		}
		if (riadok[0] == 'E') {
			scanf("%d\n", &ninp);
			for (i=0; i<ninp; i++) {
				scanf("%d\n", inputs + i);
				ex(inputs[i]);
			}
			printf("\n");
			scanf("\n");
			prp = prg;
		}
	}
	return 0;
}