cf861a

cf861a

​​ A. k-rounding time limit per test 1 second

memory limit per test 256 megabytes

input standard input

output standard output

For a given positive integer n denote its k-rounding as the minimum positive integer x, such that x ends with k or more zeros in base 10and is divisible by n.

For example, 4-rounding of 375 is 375·80 = 30000. 30000 is the minimum integer such that it ends with 4 or more zeros and is divisible by 375.

Write a program that will perform the k-rounding of n.

Input The only line contains two integers n and k (1 ≤ n ≤ 109, 0 ≤ k ≤ 8).

Output Print the k-rounding of n.

Examples input 375 4 output 30000 input 10000 1 output 10000 input 38101 0 output 38101 input 123456789 8 output 12345678900000000 寻找二或五的个数就可以知道十的个数

#includeint n,k,f[10];int main(){ freopen("cf.in","r",stdin); scanf("%d%d",&n,&k); int nn=n; while (nn%5==0||nn%2==0){ if (nn%5==0) nn/=5,f[5]++; if (nn%2==0) nn/=2,f[2]++; } long long tmp=1; for (int i=f[5]+1;i<=k;++i) tmp*=5; for (int i=f[2]+1;i<=k;++i) tmp*=2; tmp*=n; printf("%lld",tmp); return 0;}

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