#include<bits/stdc++.h>

using namespace std;

#define ll             long long
#define ld             long double
#define si(a)          scanf("%d",&a)
#define sl(a)          scanf("%lld",&a)
#define ss(a)          scanf("%s",a);
#define sc(a)          scanf("%c",&a);
#define pi(n)          printf("%d ",n)
#define pinl(n)        printf("%d\n",n)
#define pl(n)          printf("%lld",n)
#define plnl(n)        printf("%lld\n",n)
#define ps(n)          printf("%s",n)
#define psnl(n)        printf("%s\n",n)
#define pc(n)          printf("%c",n)
#define pcnl(n)        printf("%c\n",n)
#define f(i,a,b)       for(i=a;i<b;i++)
#define fd(i,a,b)      for(i=a;i>b;i--)
#define MOD5           100000
#define MOD7           10000000
#define MOD9           1000000000
#define PI             3.14159265358979323846
#define pb             push_back
#define mp             make_pair
#define all(n)         n.begin(),n.end()
#define fir            first
#define sec            second
#define is(a)          cout<<"Value is : "<<a<<endl
#define SET(a,b)       memset(a,b,sizeof(a))

ll a[10000000],b[100000],x1,x2,x3,x4,x5,x6,a7,a8,c[1000000],t,i,j,f;
char s[1000000],ss;
int main()
{
    sl(t);
   sl(j);
   cout<<(t-1)+((j-1)*(t));
    return 0;
}