#include<stdio.h>
int main()
{
int i,k,n,a;
float b[7]={1.50,2.50,3.50,4.50,5.50},cal;
while(scanf("%d",&n)!=EOF){
cal=0;
for(i = 0;i < n;i++){
scanf("%d %d",&k, &a);
k=k%1000;
cal += a * b[k-1];
}
printf("%.2f\n",cal);
}
return 0;
}
int main()
{
int i,k,n,a;
float b[7]={1.50,2.50,3.50,4.50,5.50},cal;
while(scanf("%d",&n)!=EOF){
cal=0;
for(i = 0;i < n;i++){
scanf("%d %d",&k, &a);
k=k%1000;
cal += a * b[k-1];
}
printf("%.2f\n",cal);
}
return 0;
}
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