/*
#include <stdio.h>
int main()
{
int h,m,s,t,eh,em,es;
scanf("%d %d %d %d",&h,&m,&s,&t);
es=(s+t)%60;
em= (m +(s+t)/60)%60;
eh=(h+(m +(s+t)/60)/60)%24;
printf("%d %d %d",eh,em,es);
return 0;
}
*/
#include <stdio.h>
int main()
{
int i,sum=0;
double s,e,a=0;
for(i=1 ; i<=5 ; i++)
{
scanf("%lf %lf",&s,&e);
if(e-s>=1&&e-s<=4)
{
a=e-s+a;
}
}
if(a>=15)
{
sum=(a*10000)*95/100;
}
else if(a<=5)
{
sum=(a*10000)*105/100;
}
else
{
sum=a*10000;
}
printf("%d",sum);
return 0;
}