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15 lines
238 B
C
15 lines
238 B
C
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#include <stdio.h>
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int n;
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double p1, p2, p3, q1, q2, q3;
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int main() {
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scanf("%d%lf%lf%lf%lf%lf%lf", &n, &p1, &p2, &p3, &q1, &q2, &q3);
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double win = p1 * q2 + p2 * q3 + p3 * q1;
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printf("%.4lf\n", win * n);
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return 0;
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}
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