#include <bits/stdc++.h>
#include <atcoder/all>

using namespace std;

//#define DISABLE_PRINT

#if defined(ENABLE_PRINT) && !defined(DISABLE_PRINT)

#define P(...) fprintf(stderr, __VA_ARGS__)
#define P2(fmt) fprintf(stderr, fmt)
#define LP fprintf(stderr, "L: %d\n", __LINE__)

#else

#define P(...) ((void)0)
#define P2(fmt) ((void)0)
#define LP ((void)0)

#endif

#define rep(i, n) for(int i = 0; i < (int)(n); ++i)
#define ALL(x) x.begin(),x.end()

using ll = long long;
using ull = unsigned long long;

int main(int, const char**)
{
    string S; cin >> S;
    int x[2] = {};
    int xi = 0;
    
    for(auto c : S) {
        if(c == '/') {
            xi++;
            continue;
        }
        auto v = c - '0';
        x[xi] *= 10;
        x[xi] += v;
    }

    printf("%.10f\n", (double)x[0] / x[1]);
    return 0;
}