# Enter your code here. Read input from STDIN. Print output to STDOUT
import sys

idata =sys.stdin.readline()
data = idata.split(" ")
m = int(data[0])
n = int(data[1])
#one cut needed to cut 2.
cuts = 1
if m>1:
    cuts = cuts*m-1
if  n >1:
    cuts =cuts* n-1
    
print cuts