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无聊#include "stdio.h"
void main()
{
int s[11],t[11],l;
int n,i;
while(1)
{
l=0;
scanf("%d",&n);
if(n==-1)break;
for(i=0;i<n;i++)
{
scanf("%d%d",&s[i],&t[i]);
}
for(i=0;i<n;i++)
{
if(i==0)l+=s[i]*t[i];
else l+=s[i]*(t[i]-t[i-1]);
}
printf("%d miles\n",l);
}
}
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