35 lines
550 B
C
35 lines
550 B
C
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#include <stdio.h>
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#include <stdlib.h>
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#define MAX 12
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int rollProbability(int number) {
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int sum = 0;
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for (int i=1; i<=6; i++) {
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for (int j=1; j<=6; j++) {
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if (i+j == number) {
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sum++;
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}
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}
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}
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return sum;
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}
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int main(int argc, char **argv) {
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int hotels;
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int distances[MAX];
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scanf("%d", &hotels);
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float sum = 1/6;
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for (int i=0; i<hotels; i++) {
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scanf("%d", &distances[i]);
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}
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for (int i=0; i<hotels; i++) {
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sum += rollProbability(distances[i]) / 36.0;
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}
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printf("%f\n", sum);
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return 0;
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}
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