#include<iostream>#include<cstring>#include<cstdio>#include<algorithm>using namespace std;int a[25];int main(){    long long x;    while(~scanf("%lld",&x))    {        int cnt = 0;        if(x%10 >= 5)    x = x/10+1;        else        x = x/10;        if(x == 0)        {            printf("0.00\n");            continue;        }        while(x)        {            a[++cnt] = x%10;            x /= 10;        }        if(cnt > 2)        {            for(;cnt > 2;cnt--) printf("%d",a[cnt]);        }        else        {            printf("0");        }        printf(".");        if(cnt == 1)    printf("0");        for(;cnt > 0;cnt--) printf("%d",a[cnt]);        printf("\n");    }    return 0;}