#include <stdio.h>

int persentage(int x,int y){
	int r;
	r = x*1000/y;
	if(r % 10 >= 5){r = (r/10)+ 1;}
	else{r = r/10;}
	return r;
}

int main(void) {
	int a,b,mins=10000,ina,inb;
	scanf("%d%d",&ina,&inb);
	for(a = 0;a <= 1000;a++){
		for(b = 0;b <= 1000;b++){
			if(a == 0 && b == 0){continue;}
			if(ina == persentage(a,(a+b)) && inb == persentage(b,(a+b))){
				if(mins > (a+b)){mins=a+b;}
			}
		}
	}
	printf("%d\n",mins);
	return 0;
}