joj 1167 How Many Eggs Do I Have?

#include<stdio.h>
int ch_mod(int b[],int m[],int n,int sum){
int i;
int count=0;
int y[5],M[5];
for(i=0;i<n;i++){
y[i]=1;
M[i]=sum/m[i];
while((M[i]*y[i])%m[i]!=1) y[i]++;
count+=b[i]*M[i]*y[i];
}
return count%sum;
}
int main(){
int b[5],m[5],n,i,sum;
while(scanf("%d",&n)!=EOF,n){
sum=1;
for(i=0;i<n;i++){
scanf("%d%d",&m[i],&b[i]);
sum*=m[i];
}
printf("%d/n",ch_mod(b,m,n,sum));
}
return 0;
}