/*#include<cstdio>
int main(){
int y, m, d;
scanf("%d%d%d", &y, &m, &d);
if((y + m + d) / 100 % 10 % 2 == 0)
printf("대박");
else
printf("그럭저럭");
}*/
/*#include<cstdio>
int main(){
double a, b;
scanf("%lf%lf", &a, &b);
double res;
res = (a - 100) * (9/10);
double ans;
ans = ((b - res) * 100) / res;
if(ans<=10)
printf("정상");
else if(10<ans<=20)
printf("과체중");
else if(ans>20)
printf("비만");
}
import math
a, b = input().split('x')
if int(b) < 0:
b = -int(b)
a = -int(a)
x = round(-int(b) / int(a), 2)
print("%.2f" %x)
*/
int