/*
 ============================================================================
 Name        : Project1_Solution.c
 Author      : 
 Version     :
 Copyright   : Your copyright notice
 ============================================================================
 */

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

int main(void) {
	TC_BEGIN;

	int i, base, numb1, numb2, temp;
	int maxDegree=0, max, degree=0, sum1=0, sum2=0, result=0;
	char operation;

	//Take inputs from the user.
	scanf("%d", &base);
	scanf("\n%c", &operation);
	scanf("\n%d", &numb1);
	scanf("\n%d", &numb2);

	//Convert first number into base 10.
	while(numb1 > 0 ){
		temp = numb1 % 10;
		sum1 += temp * pow(base,degree);

		numb1 = numb1/10;
		degree++;
	}

	degree = 0;
	//Convert second number into base 10.
	while(numb2 > 0 ){
		temp = numb2 % 10;
		sum2 += temp * pow(base,degree);

		numb2 = numb2/10;
		degree++;
	}

	//Make related operation.
	switch(operation){
		case 'a': result = sum1 + sum2; break;
		case 's': result = sum1 - sum2; break;
		case 'd': result = sum1 / sum2; break;
		case 'm': result = sum1 * sum2; break;
	}

	//Find max degree of result.
	//For example:
	//if Base=2 and Result=8, then maxDegree=3.
	//if Base=7 and Result=686, then maxDegree=3.
	while(pow(base, maxDegree) < result){
		if(pow(base, maxDegree+1) > result)
			break;
		maxDegree++;
	}

	//Print the final result on the screen.
	for(i = maxDegree; i >= 0; i--){
		max = pow(base, i);
		printf("%d", result/max);

		result = result%max;
	}

	TC_END;
	return 0;
}