#include<bits/stdc++.h>
using namespace std;
#define LL long long
const int Mx=1e6;
int n,m;
LL p[105];
LL l[105],r[105];
char S[10];
int len;
double mi=1.0;
int main() {
    scanf("%d",&n);
    for(int i=1; i<=n; ++i) {
        scanf("%s",&S);
        len=strlen(S);
        if(S[0]=='1')p[i]=1;
        for(int j=2; j<len; ++j)
            p[i]=p[i]*10+(S[j]^48);
    }
    int Base=1;
    for(int i=1; i<len; ++i)Base=Base*10;
    for(int i=1; i<=n; ++i) {
        p[i]*=10;
        l[i]=p[i]-5,r[i]=p[i]+5;
    }
    while(m<=Mx) {
        ++m;
        bool f=true;
        LL L=0,R=0;
        for(int i=1; i<=n; ++i) {
            LL xx=l[i]*m,yy=r[i]*m;
            LL x=xx/Base,y=yy/Base;
            if(xx%Base!=0)x++;
            if(yy%Base==0)y--;
            if(x>y)f=false;
            L+=x;R+=y;
            if(!f)break;
        }
        if(L>m||R<m)f=false;
        if(f)break;
    }printf("%d",m);
    return 0;
}