#include<stdio.h>
#include<math.h>
int main(){
int n,t,i,c,v,aux,total,maior=-1;
 
scanf("%d %d", &n, &t);
for (i=1; i<=n;i++){
    scanf("%d %d", &c, &v);
    if (c<=t){
    aux=t/c;
    total=aux*v;
    total=floor(total);
 
    if (total>maior){
        maior=total;
 
    }}
}
printf("%d\n", maior);
 
return 0;
}
 
 

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