#include <iostream>
#include <iomanip>
using namespace std;
int main(int argc, char const *argv[])
{
int fidelcastroLol;
char juveno;
cin >> fidelcastroLol, juveno;
float matriz[12][12];
for (int i=0; i<12; i++) {
for (int j=0; j<12; j++) {
cin >> matriz[i][j];
}
}
float resultado = 0.0;
for (int i=0; i<12; i++) {
if (juveno == 'S') {
resultado += matriz[fidelcastroLol][i];
} else if (juveno == 'M') {
resultado += matriz[fidelcastroLol][i]/12;
}
}
cout << fixed << setprecision(1) << resultado << endl;
return 0;
}
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