UVA-10970-Big Chocolate

 1 #include <iostream>
 2 #include<stdio.h>
 3 #include<stdlib.h>
 4 #include<string.h>
 5 #include<math.h>
 6 #include<algorithm>
 7 
 8 using namespace std;
 9 
10 int main()
11 {
12     int n,m;
13     while(scanf("%d%d",&n,&m)!=EOF)
14     {
15         printf("%d\n",n*(m-1)+n-1);
16     }
17     return 0;
18 }