#include<bits/stdc++.h>
#define re register
#define ll long long
using namespace std;
int n,m,k,a[5000009],b[5000009],ans,s;
char c;
inline int read()
{
    int x,f=1,c;
    while((c=getchar())>'9'||c<'0')f=(c=='-'?-1:1);x=c-'0';
    while((c=getchar())>='0'&&c<='9')x=(x<<3)+(x<<1)+c-'0';
    return x*f;
}
int main()
{
	m=read(),n=read(),k=read();
	for(re int i=1;i<=k;++i)
	{
		c=getchar(),s=read();
		if(c=='R')
		++a[s];
		else
		++b[s];
	}
	for(re int i=1;i<=n;++i)
	for(re int j=1;j<=m;++j)
	{
		if((a[i]+b[j])%2)
		++ans;
	}
	cout<<ans;
	return 0;
}