uva568 Just the Facts
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
#include<stdio.h> #include<string.h> int main() { int n, i, j, k; long long s = 0; while(scanf("%d",&n) != EOF) { printf("%5d -> ", n); s = 1; for(i = 2;i <= n; i++) { s *= i; while(s%10 == 0) s /= 10; if(s > 1000000000000) s %= 1000000000000; } printf("%lld\n",s%10); } return 0; }