```#include <iostream>
using namespace std;

int main() {
	int x, y;
	scanf("%d %d", &x, &y);
	printf("%.1lf", (x - 1) * 2.5 + y * 1.5);
	return 0;
}

language

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#include<bits/stdc++.h>
using namespace std;

int main(){
    int x,y;
    double a;
    cin>>x>>y;
    a=(x - 1) * 2.5 + y * 1.5;;
    printf("%.1lf\n",a);
    return 0;
}