UVa 10970.cpp

/*BISMILLAHIR RAHMANIR RAHIM*/
#include<bits/stdc++.h>
#define case(res) printf("Case %d: %d\n", i, res)
#define PI acos(-1)
#define lli long long int
#define loop(a, n, x) for(int i=a; i<=n; i+=x)
#define npoint(x) fixed << setprecision(x)
/*-----------------ANUPAM AKIB-------------------*/

using namespace std;
int main(){
    int m, n;
    while(scanf("%d %d", &m, &n)!=EOF){
        cout << (m*n)-1 << endl;
    }
    return 0;
}