#include<stdio.h>
#include<string.h>
int main()
{
    char a[10000][20000],b[10000][20000];
    int i=0,j,k,n=0,x,t;
    float mi;
    while(strcmp(gets(a[i]),"EOF")!=0)
    {
        i++;
    }
    k=i+1;
    for(j=0;j<i+1;j++)
        gets(b[j]);
    for(i=0;i<k-1;i++)
        for(j=0,x=0;b[i][j]!=0||a[i][x]!=0;j++,x++)
        {
            if(b[i][j]=='<'&&a[i][x]!='<')
            {
                x-=2;
                if(x<-1)
                    x=-1;
                continue;
            }
            if(a[i][x]=='<'&&b[i][j]!='<')
            {
                j-=2;
                if(j<-1)
                    j=-1;
                continue;
            }
            if(b[i][j]==a[i][x]&&b[i][j]!='<')
            {
                n++;
            }
        }
    scanf("%d",&t);
    mi=t/60.0;
    printf("%d\n",(int)(n/mi+0.5));
}