#include <stdio.h>
int main(){
char o;
int i, j, l = 1;
double s = 0, n;
scanf("%c", &o);
for (i = 0; i <= 4; i++){
for (j = 0; j <= 11; j++){
scanf("%lf", &n);
if (j >= l && j <= 11 - l)
s += n;
}
l++;
}
if (o == 'S')
printf("%.1f\n", s);
else
printf("%.1f\n", s / 30);
return 0;
}
int main(){
char o;
int i, j, l = 1;
double s = 0, n;
scanf("%c", &o);
for (i = 0; i <= 4; i++){
for (j = 0; j <= 11; j++){
scanf("%lf", &n);
if (j >= l && j <= 11 - l)
s += n;
}
l++;
}
if (o == 'S')
printf("%.1f\n", s);
else
printf("%.1f\n", s / 30);
return 0;
}
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