#include<iostream>
using namespace std;
int main()
{
    int a,b;
    cin>>a>>b;
    if(a<0||b<0)
        return -1;
	float c=b;
    float totalPrice=a+c/10;
    float unitPrice=1.9;
    int num=(int)(totalPrice/unitPrice);
	cout<<num<<endl;
    return 0;
}
 

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