using System;
using System.Collections.Generic;
using System.Collections;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.IO;
using System.Reflection;
using static System.Math;
using System.Numerics;
static class Program{
	const int mod=(int)1e9+7;
	const double eps=1e-11;
	static void Main(){
		Sc sc=new Sc();
		var s=sc.Ia;
		var t=new Tuple<string,int,int,int,int>[s[0]];
		for(int i = 0;i<s[0];i++) {
			var e=sc.Sa;
			var h=new int[3];
			for(int j = 0;j<e[0].Length;j++) {
				if(e[0][j]=='J'){h[0]++;}
				else if(e[0][j]=='O'){h[1]++;}
				else{h[2]++;}
			}
			t[i]=Tuple.Create(e[0],h[0],h[1],h[2],int.Parse(e[1]));
		}
		long inf=(long)1e18;
		int m=s[1]+83;
		var dp1=Enumerable.Repeat(inf,m).ToArray();
		var dp2=Enumerable.Repeat(inf,m).ToArray();
		var dp3=Enumerable.Repeat(inf,m).ToArray();
		dp1[0]=dp2[0]=dp3[0]=0;
		for(int i = 0;i<s[0];i++) {
			if(t[i].Item2==0){continue;}
			for(int j = t[i].Item2;j<m;j++) {dp1[j]=Min(dp1[j],dp1[j-t[i].Item2]+t[i].Item5);}
		}
		for(int i = 0;i<s[0];i++) {
			if(t[i].Item3==0){continue;}
			for(int j = t[i].Item3;j<m;j++) {dp2[j]=Min(dp2[j],dp2[j-t[i].Item3]+t[i].Item5);}
		}
		for(int i = 0;i<s[0];i++) {
			if(t[i].Item4==0){continue;}
			for(int j = t[i].Item4;j<m;j++) {dp3[j]=Min(dp3[j],dp3[j-t[i].Item4]+t[i].Item5);}
		}
		for(int i = m-2;i>0;i--) {
			dp1[i]=Min(dp1[i],dp1[i+1]);
			dp2[i]=Min(dp2[i],dp2[i+1]);
			dp3[i]=Min(dp3[i],dp3[i+1]);
		}
		long ans=dp1[s[1]]+dp2[s[1]]+dp3[s[1]];
		for(int i = 0;i<s[0];i++) {
			var g=t[i].Item1;
			var h=new int[3];
			for(int k = 0;k<g.Length;k++) {
				if(g[k]=='J'){h[0]++;}
				else if(g[k]=='O'){h[1]++;}
				else{h[2]++;}
				if(g[k]!='J'){continue;}
				for(int j = 0;j<s[0];j++) {
					var f=t[j].Item1;
					var d=new int[3];
					for(int l = 0;l<f.Length;l++) {
						if(f[l]=='J'){d[0]++;}
						else if(f[l]=='O'){d[1]++;}
						else{d[2]++;}
						ans=Min(ans,dp1[Max(0,s[1]-h[0])]+dp2[Max(0,s[1]-t[i].Item3+h[1]-d[1])]+dp3[Max(0,s[1]-t[j].Item4+d[2])]+t[i].Item5+t[j].Item5);
					}
				}
				if(t[i].Item3-h[1]>=s[1]){
					var d=new int[3];
					for(int j = g.Length-1;j>k;j--) {
						if(g[j]=='J'){d[0]++;}
						else if(g[j]=='O'){d[1]++;}
						else{d[2]++;}
						if(t[i].Item3-h[1]-d[1]>=s[1]){ans=Min(ans,dp1[Max(0,s[1]-h[0])]+dp3[Max(0,s[1]-d[2])]+t[i].Item5);}
						else{break;}
					}
				}
			}
		}
		Console.WriteLine("{0}",ans>=inf?-1:ans);
	}
}

public class Sc{
	public int I{get{return int.Parse(Console.ReadLine());}}
	public long L{get{return long.Parse(Console.ReadLine());}}
	public double D{get{return double.Parse(Console.ReadLine());}}
	public string S{get{return Console.ReadLine();}}
	public int[] Ia{get{return Array.ConvertAll(Console.ReadLine().Split(),int.Parse);}}
	public long[] La{get{return Array.ConvertAll(Console.ReadLine().Split(),long.Parse);}}
	public double[] Da{get{return Array.ConvertAll(Console.ReadLine().Split(),double.Parse);}}
	public string[] Sa{get{return Console.ReadLine().Split();}}
	public object[] Oa{get{return Console.ReadLine().Split();}}
	public int[] Ia2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),int.Parse);}}
	public int[] Ia3(int a){return Array.ConvertAll((a.ToString()+" "+Console.ReadLine()).Split(),int.Parse);}
	public int[] Ia3(bool a,int b,bool c,int d){return Array.ConvertAll(((a?b.ToString()+" ":"")+Console.ReadLine()+(c?" "+d.ToString():"")).Split(),int.Parse);}
	public long[] La2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),long.Parse);}}
	public long[] La3(int a){return Array.ConvertAll((a.ToString()+" "+Console.ReadLine()).Split(),long.Parse);}
	public long[] La3(bool a,int b,bool c,int d){return Array.ConvertAll(((a?b.ToString()+" ":"")+Console.ReadLine()+(c?" "+d.ToString():"")).Split(),long.Parse);}
	public double[] Da2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),double.Parse);}}
	public double[] Da3(int a){return Array.ConvertAll((a.ToString()+" "+Console.ReadLine()).Split(),double.Parse);}
	public double[] Da3(bool a,int b,bool c,int d){return Array.ConvertAll(((a?b.ToString()+" ":"")+Console.ReadLine()+(c?" "+d.ToString():"")).Split(),double.Parse);}
	public T[] Arr<T>(int n,Func<T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f();}return a;}
	public T[] Arr<T>(int n,Func<int,T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i);}return a;}
	public T[] Arr<T>(int n,Func<string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(Console.ReadLine().Split());}return a;}
	public T[] Arr<T>(int n,Func<int,string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i,Console.ReadLine().Split());}return a;}
}