#include<stdio.h>
#include<stdlib.h>
int scan(){int ip=getc(stdin),ret=0;for(;ip<'0'||ip>'9';ip=getc(stdin));for(;ip>='0'&&ip<='9';ip=getc(stdin))ret=ret*10+ip-'0';return ret;}
int main(){
int n ,q,r,s,t=0,u=0;
char c[10];
n=scan();
q=scan();
int *col=(int *)calloc(n,sizeof(int));
int *row=(int *)calloc(n,sizeof(int));
while(q--){
scanf("%s",c);     /* SOME ERROR HERE   and how to use getchar_unlocked for char here*/
r=scan();
s=scan();
if(c[0]=='R'){
    row[r-1]+=s;
    if(row[r-1]>u)
        u=row[r-1];
}
else {
    col[r-1]+=s;
    if(col[r-1]>t)
        t=col[r-1];
}
}
printf("%d",t+u);
free(row); free(col);
return 0;
}
 

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MiA0ClJvd0FkZCAxIDMKQ29sQWRkIDIgMQpDb2xBZGQgMSA0ClJvd0FkZCAyIDE=

2 4
RowAdd 1 3
ColAdd 2 1
ColAdd 1 4
RowAdd 2 1