//大数阶乘 #include<iostream> #include<cstdio> #include<cstring> using namespace std; int a[50000]; int n; int main(){ scanf("%d",&n); memset(a,0,sizeof(a)); int len = 1; a[1] = 1; int i,j; for( i = 1; i <= n; i++ ){ for( j = 1; j <= len; j++ ) a[j] *= i; for( j = 1; j <= len; j++ ){ if( a[j] < 10 ) continue ; int pos = j; while( pos<=len ){ if( a[len] > 9 ) len++; a[pos+1] += a[pos]/10; a[pos] %= 10; pos++; } } } for( i = len; i >= 1; i-- ) printf("%d",a[i]); printf("\n"); return 0; }