This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<cstdio>
int a,b,i,c,j,k,S,g,h,w[3333][3333],z[3333][3333];
char s[3333];
int sum(int x1,int y1,int x2,int y2)
{
	return z[x2][y2]-z[x2][y1-1]-z[x1-1][y2]+z[x1-1][y1-1];
}
main()
{
	scanf("%d%d",&a,&b);
	for(i=1;i<=a;i++)
	{
		scanf("%s",s);
		for(j=0;j<b;j++)
		{
			if(s[j]=='R')w[i][j+1]=1;
		}
	}
	for(i=1;i<=a;i++)
	{
		for(j=1;j<=b;j++)
		{
			if(w[i][j]==0)
			{
				S+=i*j;
			}
		}
	}
	printf("%d",a*(a+1)/2*b*(b+1)/2-S);
}
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