#include<stdio.h>
#include<string.h>
int gcd(int x, int y) {
	if (y == 0) return x;
	gcd(y, x%y);
}
int main() {
	int n;
	int a, b,x;
	char c;
	int zh = 0;
	int ans1, ans2;
	scanf("%d", &n);
	for (int i = 1; i <= n; i++) {
		scanf("%d%c%d", &a, &c, &b);
		if (i == 1) {
			if(a>0) x = gcd(a, b);
			else if(a<0) x = gcd(-1*a, b);
			ans1 = a / x;
			ans2 = b / x;
			zh += ans1 / ans2, ans1 -= ans2 * (ans1 / ans2);
		}
		else {
			ans1 = ans1 * b + ans2 * a;
			ans2 = ans2 * b;
			if(ans1>0) x = gcd(ans1, ans2);
			else if(ans1<0) x = gcd(-1*ans1, ans2);
			ans1 /= x;
			ans2 /= x;
		    zh += ans1 / ans2, ans1 -= ans2 * (ans1 / ans2);
		}
	}
	if(zh!=0&&ans1!=0){
		if(zh>0) printf("%d %d/%d\n", zh, ans1, ans2);
		else printf("%d %d/%d\n", zh, -1*ans1, ans2);
	}
	else if(ans1==0) printf("%d\n",zh);
	else printf("%d/%d\n",ans1, ans2);
}