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| #include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
ll lcm(ll a, ll b) { return 1ll * a * b / gcd(a, b); }
int main() {
bool flag = 0;
ll ra = 0, rb = 1, a, b, tmp;
while (~scanf("%lld/%lld", &a, &b)) {
tmp = lcm(rb, b);
ra = ra * tmp / rb + a * tmp / b, rb = tmp;
if (ra < 0) flag = 1, ra = -ra;
tmp = gcd(ra, rb);
ra /= tmp, rb /= tmp;
if (flag) flag = 0, ra = -ra;
}
printf("%lld", ra);
if (rb != 1) printf("/%lld", rb);
return 0;
}
|