def criaMatriz(): matriz = [] linha = [] for i in range(12): matriz.append(linha) for j in range(12): x = float(input()) linha.append(x) linha = [] return matriz f = str(input()) mat = criaMatriz() s = 0 m = 0 if f=="S": for l in range(12): for k in range(12): if k<11-l and not k>l: s = s + float(mat[l][k]) print("%.1f"%s) elif f=="M": for l in range(12): for k in range(12): if k<11-l and not k>l: s = s + float(mat[l][k]) m = s / 30 print("%.1f"%m)