#include <stdio.h>
int main() {
char o;
int i, j, c;
float s = 0.0, n;
scanf("%d ", &c);
scanf("%c", &o);
for (i = 0; i <= 11; i++) {
for (j = 0; j <= 11; j++) {
scanf("%f", &n);
if (i == c) s += n;
}
}
if (o == 'S') printf("%.1f\n", s);
else printf("%.1f\n", s / 12);
return 0;
}
int main() {
char o;
int i, j, c;
float s = 0.0, n;
scanf("%d ", &c);
scanf("%c", &o);
for (i = 0; i <= 11; i++) {
for (j = 0; j <= 11; j++) {
scanf("%f", &n);
if (i == c) s += n;
}
}
if (o == 'S') printf("%.1f\n", s);
else printf("%.1f\n", s / 12);
return 0;
}
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