include <stdio.h>

int main() {

int a, b, c, d, e, f, g, h, a1, a2, a3, b1, b2, b3, q1, q2, q3, m;
scanf("%d%d%d%d%d%d%d", &a, &b, &c, &d, &e, &f, &g);
if (a % b == 0) {
	q1 = a / b * c;
} else {
	q1 = (a / b + 1) * c;
}
if (a % d == 0) {
	q2 = a / d * e;
} else {
	q2 = (a / d + 1) * e;
}
if (a % f == 0) {
	q3 = a / f * g;
} else {
	q3 = (a / f + 1) * g;
}
if (q1 > q2) {
	m = q2;
} else {
	m = q1;
}
if (m > q3) {
	m = q3;
}
printf("%d", m);
return 0;

}

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