#include <stdio.h>
#include <stdlib.h>

int main()
{
    int m,n,r;
    while((scanf("%d %d",&m,&n))!=EOF)
    {
        r=(m*n)-1;
        printf("%d\n",r);
    }
    return 0;
}

#include <iostream>

using namespace std;

int main()
{
    int t,i,r;
    double l,w,right_x,p_left_x,n_left_x,y,z;
    cin>>t;
    for(i=1;i<=t;i++)
    {
        cin>>r;
        l=(100.0/20.0)*r*1.0;
        w=(60.0/100.0)*l*1.0;
        p_left_x= ((45.0/100.0)*l*1.0);
        n_left_x= - p_left_x;
        right_x=(l-p_left_x);
        y=((w*1.0)/2.0);
        z= -y;
        cout<<"Case "<<i<<":"<<endl;
        cout<<n_left_x<<" "<<y<<endl;
        cout<<right_x<<" "<<y<<endl;
        cout<<right_x<<" "<<z<<endl;
        cout<<n_left_x<<" "<<z<<endl;

    }
    return 0;
}

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int i,n;
    scanf("%d",&n);

    for(i=0;i<n;i++)
    {
        long long int s,d,a,b;
        scanf("%lld %lld",&s,&d);
        a=(s+d)/2;
        b=(s-d)/2;
        if((a+b)==s && (a-b)==d && a>=0 && b>=0)

        {
            printf("%d %d\n",a,b);
        }
        else
        {
            printf("impossible\n");
        }

    }
    return 0;
}

#include <bits/stdc++.h>

using namespace std;

int main()
{
    //freopen("in.txt","r",stdin);
    //freopen("out.txt","w",stdout);
    int n,k,p,i,t,j,a,b,c;
    cin>>t;
    for(i=1; i<=t; i++)
    {
        cin>>n>>k>>p;
        c=p%n;
        a=n-k;
        if(a<c)
        {
            b=c-a;
        }
        else if(a>=c)
        {
            b=k+c;
        }
        cout<<"Case "<<i<<": "<<b<<endl;
    }
    return 0;
}

#include <stdio.h>
#include <stdlib.h>

int main()
{

    int v,t,s;
    while((scanf("%d %d",&v,&t))!=EOF)
    {
        s=2*v*t;
        printf("%d\n",s);
    }
    return 0;
}