#include <stdio.h>

int main(void) {

	int a,b;
	int c;
	char e;

	printf("&#49688;&#47484; &#51077;&#47141;&#54616;&#49464;&#50836; :");
	scanf("%d", &a);
	printf("&#49688;&#47484; &#51077;&#47141;&#54616;&#49464;&#50836; :");
	scanf("%d", &b);
	printf("&#50672;&#49328;&#51088;&#47484; &#49440;&#53469;&#54616;&#49464;&#50836; :");
	scanf("%c", &e);

	if(e == 'a') {
		c=a+b;
		printf("%d", c);
	}

}