#include <stdio.h>

int main()
{
    //number line program
    int a, b, i;
    char c;
    scanf("%d %d\n", &a, &b); //a is the number and b is the number to be added or subtracted
    for(i=1; i<=3; i++) {
        scanf("%c", &c);
        if(c=='L') {
            a=a-b;
        }
        else if(c=='R') {
            a=a+b;
        }
    }
    printf("%d", a);
}