#include <stdio.h>
int main(){
    char p,l,o,k,m;
    int n=0;
    scanf("%c %c %c %c %c",&p,&l,&o,&k,&m);
    if(p=='D')n=n+30;
    if(l=='C')n=n+30;
    if(o=='B')n=n+30;
    if(k=='A')n=n+30;
    if(m=='D')n=n+30;
    printf("%d",n);
    return 0;
}